DailyCodeChallenges

Daily coding exercises, challenges, and snippets to enhance programming skills incrementally

Array

0015-3sum
0042-trapping-rain-water
0073-set-matrix-zeroes
0075-sort-colors
0108-convert-sorted-array-to-binary-search-tree
0330-patching-array
0496-next-greater-element-i
0502-ipo
0523-continuous-subarray-sum
0648-replace-words
0735-asteroid-collision
0853-most-profit-assigning-work
0943-sum-of-subarray-minimums
0982-minimum-increment-to-make-array-unique
1016-subarray-sums-divisible-by-k
1037-minimum-number-of-k-consecutive-bit-flips
1137-height-checker
1217-relative-sort-array
1370-count-number-of-nice-subarrays
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1605-minimum-number-of-days-to-make-m-bouquets
1675-magnetic-force-between-two-balls
2148-minimum-number-of-moves-to-seat-everyone

Hash Table

0073-set-matrix-zeroes
0496-next-greater-element-i
0523-continuous-subarray-sum
0648-replace-words
0893-all-nodes-distance-k-in-binary-tree
1016-subarray-sums-divisible-by-k
1029-vertical-order-traversal-of-a-binary-tree
1217-relative-sort-array
1370-count-number-of-nice-subarrays

String

0006-zigzag-conversion
0020-valid-parentheses
0402-remove-k-digits
0648-replace-words

Trie

0648-replace-words

Math

0523-continuous-subarray-sum
0633-sum-of-square-numbers
0738-monotone-increasing-digits
1370-count-number-of-nice-subarrays

Prefix Sum

0523-continuous-subarray-sum
1016-subarray-sums-divisible-by-k
1037-minimum-number-of-k-consecutive-bit-flips

Tree

0100-same-tree
0101-symmetric-tree
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0108-convert-sorted-array-to-binary-search-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0124-binary-tree-maximum-path-sum
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0543-diameter-of-binary-tree
0893-all-nodes-distance-k-in-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1035-cousins-in-binary-tree
1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Depth-First Search

0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0124-binary-tree-maximum-path-sum
0199-binary-tree-right-side-view
0543-diameter-of-binary-tree
0893-all-nodes-distance-k-in-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1035-cousins-in-binary-tree
1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Breadth-First Search

0100-same-tree
0101-symmetric-tree
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0111-minimum-depth-of-binary-tree
0199-binary-tree-right-side-view
0893-all-nodes-distance-k-in-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1035-cousins-in-binary-tree

Binary Tree

0100-same-tree
0101-symmetric-tree
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0108-convert-sorted-array-to-binary-search-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0124-binary-tree-maximum-path-sum
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0543-diameter-of-binary-tree
0893-all-nodes-distance-k-in-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1035-cousins-in-binary-tree
1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Dynamic Programming

0042-trapping-rain-water
0124-binary-tree-maximum-path-sum
0943-sum-of-subarray-minimums

Two Pointers

0015-3sum
0042-trapping-rain-water
0075-sort-colors
0633-sum-of-square-numbers
0853-most-profit-assigning-work

Sorting

0015-3sum
0075-sort-colors
0502-ipo
0853-most-profit-assigning-work
0982-minimum-increment-to-make-array-unique
1029-vertical-order-traversal-of-a-binary-tree
1137-height-checker
1217-relative-sort-array
1675-magnetic-force-between-two-balls
2148-minimum-number-of-moves-to-seat-everyone

Counting Sort

0982-minimum-increment-to-make-array-unique
1137-height-checker
1217-relative-sort-array

Greedy

0330-patching-array
0402-remove-k-digits
0502-ipo
0738-monotone-increasing-digits
0853-most-profit-assigning-work
0982-minimum-increment-to-make-array-unique
1285-balance-a-binary-search-tree
2148-minimum-number-of-moves-to-seat-everyone

Binary Search

0222-count-complete-tree-nodes

Bit Manipulation

0222-count-complete-tree-nodes
1037-minimum-number-of-k-consecutive-bit-flips

Divide and Conquer

0108-convert-sorted-array-to-binary-search-tree
1285-balance-a-binary-search-tree

Binary Search Tree

0108-convert-sorted-array-to-binary-search-tree
0633-sum-of-square-numbers
0853-most-profit-assigning-work
1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree
1605-minimum-number-of-days-to-make-m-bouquets
1675-magnetic-force-between-two-balls

Heap (Priority Queue)

0502-ipo
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Stack

0020-valid-parentheses
0042-trapping-rain-water
0155-min-stack
0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0402-remove-k-digits
0496-next-greater-element-i
0735-asteroid-collision
0943-sum-of-subarray-minimums

Design

0155-min-stack
0225-implement-stack-using-queues
0232-implement-queue-using-stacks

Queue

0225-implement-stack-using-queues
0232-implement-queue-using-stacks
1037-minimum-number-of-k-consecutive-bit-flips
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Monotonic Stack

0042-trapping-rain-water
0402-remove-k-digits
0496-next-greater-element-i
0943-sum-of-subarray-minimums

Matrix

0073-set-matrix-zeroes

Sliding Window

1037-minimum-number-of-k-consecutive-bit-flips
1370-count-number-of-nice-subarrays
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Ordered Set

1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Monotonic Queue

1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit

Graph

1916-find-center-of-star-graph

Simulation

0735-asteroid-collision

LeetCode Topics

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0031-next-permutation
0042-trapping-rain-water
0075-sort-colors
0345-reverse-vowels-of-a-string
0350-intersection-of-two-arrays-ii
0392-is-subsequence
0443-string-compression
0455-assign-cookies
0567-permutation-in-string
0768-partition-labels
0941-sort-array-by-parity
1129-longest-string-chain
1615-range-sum-of-sorted-subarray-sums
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1798-max-number-of-k-sum-pairs
1880-largest-merge-of-two-strings
1894-merge-strings-alternately
1923-sentence-similarity-iii
2095-minimum-number-of-swaps-to-make-the-string-balanced
2162-partition-array-into-two-arrays-to-minimize-sum-difference
2216-delete-the-middle-node-of-a-linked-list
2236-maximum-twin-sum-of-a-linked-list
2265-partition-array-according-to-given-pivot
2271-rearrange-array-elements-by-sign
2320-find-all-k-distant-indices-in-an-array
2392-successful-pairs-of-spells-and-potions
2488-divide-intervals-into-minimum-number-of-groups
2497-maximum-matching-of-players-with-trainers
2551-apply-operations-to-an-array
2553-total-cost-to-hire-k-workers
2572-append-characters-to-string-to-make-subsequence
2581-divide-players-into-teams-of-equal-skill
2588-maximum-number-of-points-from-grid-queries
2699-count-the-number-of-fair-pairs
3018-make-string-a-subsequence-using-cyclic-increments
3195-separate-black-and-white-balls

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0008-string-to-integer-atoi
0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0038-count-and-say
0072-edit-distance
0076-minimum-window-substring
0079-word-search
0115-distinct-subsequences
0127-word-ladder
0187-repeated-dna-sequences
0208-implement-trie-prefix-tree
0241-different-ways-to-add-parentheses
0273-integer-to-english-words
0345-reverse-vowels-of-a-string
0392-is-subsequence
0394-decode-string
0395-longest-substring-with-at-least-k-repeating-characters
0399-evaluate-division
0424-longest-repeating-character-replacement
0443-string-compression
0451-sort-characters-by-frequency
0516-longest-palindromic-subsequence
0567-permutation-in-string
0583-delete-operation-for-two-strings
0649-dota2-senate
0678-valid-parenthesis-string
0692-top-k-frequent-words
0721-accounts-merge
0768-partition-labels
0889-buddy-strings
0952-word-subsets
0957-minimum-add-to-make-parentheses-valid
1058-lexicographically-smallest-equivalent-string
1093-recover-a-tree-from-preorder-traversal
1129-longest-string-chain
1146-greatest-common-divisor-of-strings
1170-shortest-common-supersequence
1197-parsing-a-boolean-expression
1250-longest-common-subsequence
1304-longest-happy-string
1350-remove-sub-folders-from-the-filesystem
1397-search-suggestions-system
1437-minimum-insertion-steps-to-make-a-string-palindrome
1460-number-of-substrings-containing-all-three-characters
1473-find-the-longest-substring-containing-vowels-in-even-counts
1502-construct-k-palindrome-strings
1524-string-matching-in-an-array
1537-maximum-score-after-splitting-a-string
1567-maximum-number-of-vowels-in-a-substring-of-given-length
1644-maximum-number-of-non-overlapping-substrings
1667-find-kth-bit-in-nth-binary-string
1668-find-longest-awesome-substring
1715-split-a-string-into-the-max-number-of-unique-substrings
1777-determine-if-two-strings-are-close
1880-largest-merge-of-two-strings
1894-merge-strings-alternately
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1915-check-if-one-string-swap-can-make-strings-equal
1923-sentence-similarity-iii
1967-longest-substring-of-all-vowels-in-order
2021-remove-all-occurrences-of-a-substring
2044-number-of-wonderful-substrings
2059-unique-length-3-palindromic-subsequences
2095-minimum-number-of-swaps-to-make-the-string-balanced
2107-find-unique-binary-string
2163-kth-distinct-string-in-an-array
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2260-divide-a-string-into-groups-of-size-k
2292-counting-words-with-a-given-prefix
2300-construct-string-with-repeat-limit
2395-longest-binary-subsequence-less-than-or-equal-to-k
2470-removing-stars-from-a-string
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2572-append-characters-to-string-to-make-subsequence
2691-count-vowel-strings-in-ranges
2727-number-of-senior-citizens
2800-minimum-string-length-after-removing-substrings
3018-make-string-a-subsequence-using-cyclic-increments
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3195-separate-black-and-white-balls
3243-count-the-number-of-powerful-integers
3276-minimum-number-of-pushes-to-type-word-ii
3305-count-prefix-and-suffix-pairs-ii
3309-count-prefix-and-suffix-pairs-i
3360-minimum-deletions-to-make-string-k-special
3395-minimum-length-of-anagram-concatenation
3447-clear-digits
3455-minimum-length-of-string-after-operations
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3617-find-the-original-typed-string-i
3618-find-the-original-typed-string-ii
3629-total-characters-in-string-after-transformations-i
3637-count-number-of-balanced-permutations
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes
3761-maximum-difference-between-even-and-odd-frequency-ii

Greedy

0011-container-with-most-water
0122-best-time-to-buy-and-sell-stock-ii
0135-candy
0334-increasing-triplet-subsequence
0410-split-array-largest-sum
0435-non-overlapping-intervals
0452-minimum-number-of-arrows-to-burst-balloons
0455-assign-cookies
0605-can-place-flowers
0621-task-scheduler
0632-smallest-range-covering-elements-from-k-lists
0649-dota2-senate
0670-maximum-swap
0678-valid-parenthesis-string
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0768-partition-labels
0780-max-chunks-to-make-sorted
0797-rabbits-in-forest
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
1033-broken-calculator
1049-minimum-domino-rotations-for-equal-row
1304-longest-happy-string
1478-maximum-number-of-events-that-can-be-attended
1499-maximum-performance-of-a-team
1502-construct-k-palindrome-strings
1529-max-difference-you-can-get-from-changing-an-integer
1604-least-number-of-unique-integers-after-k-removals
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1644-maximum-number-of-non-overlapping-substrings
1880-largest-merge-of-two-strings
1917-maximum-average-pass-ratio
2094-remove-stones-to-minimize-the-total
2095-minimum-number-of-swaps-to-make-the-string-balanced
2237-longest-palindrome-by-concatenating-two-letter-words
2300-construct-string-with-repeat-limit
2379-maximum-total-importance-of-roads
2387-partition-array-such-that-maximum-difference-is-k
2395-longest-binary-subsequence-less-than-or-equal-to-k
2488-divide-intervals-into-minimum-number-of-groups
2497-maximum-matching-of-players-with-trainers
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2572-append-characters-to-string-to-make-subsequence
2616-maximal-score-after-applying-k-operations
2636-maximum-subsequence-score
2681-put-marbles-in-bags
2704-maximum-difference-by-remapping-a-digit
2720-minimize-the-maximum-difference-of-pairs
3001-apply-operations-to-maximize-score
3080-split-array-into-maximum-number-of-subarrays
3143-longest-unequal-adjacent-groups-subsequence-i
3195-separate-black-and-white-balls
3241-divide-array-into-arrays-with-max-difference
3276-minimum-number-of-pushes-to-type-word-ii
3360-minimum-deletions-to-make-string-k-special
3743-reschedule-meetings-for-maximum-free-time-i

Graph

0133-clone-graph
0207-course-schedule
0210-course-schedule-ii
0399-evaluate-division
0547-number-of-provinces
0684-redundant-connection
0744-network-delay-time
0801-is-graph-bipartite
0803-cheapest-flights-within-k-stops
0820-find-eventual-safe-states
0871-keys-and-rooms
0984-most-stones-removed-with-same-row-or-column
1300-critical-connections-in-a-network
1424-maximum-candies-you-can-get-from-boxes
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1442-number-of-operations-to-make-network-connected
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1493-frog-position-after-t-seconds
1558-course-schedule-iv
1576-reorder-routes-to-make-all-paths-lead-to-the-city-zero
1701-remove-max-number-of-edges-to-keep-graph-fully-traversable
1706-min-cost-to-connect-all-points
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2246-maximum-employees-to-be-invited-to-a-meeting
2379-maximum-total-importance-of-roads
2438-find-closest-node-to-given-two-nodes
2583-divide-nodes-into-the-maximum-number-of-groups
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Sorting

0075-sort-colors
0215-kth-largest-element-in-an-array
0229-majority-element-ii
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0368-largest-divisible-subset
0406-queue-reconstruction-by-height
0435-non-overlapping-intervals
0451-sort-characters-by-frequency
0452-minimum-number-of-arrows-to-burst-balloons
0455-assign-cookies
0621-task-scheduler
0632-smallest-range-covering-elements-from-k-lists
0692-top-k-frequent-words
0721-accounts-merge
0780-max-chunks-to-make-sorted
0941-sort-array-by-parity
1014-k-closest-points-to-origin
1129-longest-string-chain
1256-rank-transform-of-an-array
1397-search-suggestions-system
1478-maximum-number-of-events-that-can-be-attended
1499-maximum-performance-of-a-team
1556-make-two-arrays-equal-by-reversing-subarrays
1604-least-number-of-unique-integers-after-k-removals
1615-range-sum-of-sorted-subarray-sums
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1669-minimum-cost-to-cut-a-stick
1741-sort-array-by-increasing-frequency
1777-determine-if-two-strings-are-close
1798-max-number-of-k-sum-pairs
1851-maximum-number-of-events-that-can-be-attended-ii
2160-minimum-operations-to-make-a-uni-value-grid
2215-finding-3-digit-even-numbers
2379-maximum-total-importance-of-roads
2387-partition-array-such-that-maximum-difference-is-k
2392-successful-pairs-of-spells-and-potions
2488-divide-intervals-into-minimum-number-of-groups
2497-maximum-matching-of-players-with-trainers
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2588-maximum-number-of-points-from-grid-queries
2636-maximum-subsequence-score
2646-kth-largest-sum-in-a-binary-tree
2681-put-marbles-in-bags
2699-count-the-number-of-fair-pairs
2728-sum-in-a-matrix
2888-minimum-index-of-a-valid-split
3001-apply-operations-to-maximize-score
3219-make-lexicographically-smallest-array-by-swapping-elements
3236-smallest-missing-integer-greater-than-sequential-prefix-sum
3241-divide-array-into-arrays-with-max-difference
3276-minimum-number-of-pushes-to-type-word-ii
3278-find-the-number-of-ways-to-place-people-i
3360-minimum-deletions-to-make-string-k-special
3430-count-days-without-meetings
3657-check-if-grid-can-be-cut-into-sections

Heap (Priority Queue)

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
0407-trapping-rain-water-ii
0451-sort-characters-by-frequency
0621-task-scheduler
0632-smallest-range-covering-elements-from-k-lists
0692-top-k-frequent-words
0744-network-delay-time
0789-kth-largest-element-in-a-stream
0794-swim-in-rising-water
0803-cheapest-flights-within-k-stops
1014-k-closest-points-to-origin
1304-longest-happy-string
1397-search-suggestions-system
1478-maximum-number-of-events-that-can-be-attended
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1499-maximum-performance-of-a-team
1753-path-with-minimum-effort
1917-maximum-average-pass-ratio
2054-the-number-of-the-smallest-unoccupied-chair
2094-remove-stones-to-minimize-the-total
2300-construct-string-with-repeat-limit
2379-maximum-total-importance-of-roads
2413-smallest-number-in-infinite-set
2434-design-a-number-container-system
2488-divide-intervals-into-minimum-number-of-groups
2553-total-cost-to-hire-k-workers
2588-maximum-number-of-points-from-grid-queries
2616-maximal-score-after-applying-k-operations
2636-maximum-subsequence-score
2681-put-marbles-in-bags
2728-sum-in-a-matrix
3181-find-building-where-alice-and-bob-can-meet
3332-minimum-operations-to-exceed-threshold-value-ii
3555-final-array-state-after-k-multiplication-operations-i
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Depth-First Search

0079-word-search
0094-binary-tree-inorder-traversal
0112-path-sum
0129-sum-root-to-leaf-numbers
0130-surrounded-regions
0133-clone-graph
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0226-invert-binary-tree
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0337-house-robber-iii
0386-lexicographical-numbers
0399-evaluate-division
0437-path-sum-iii
0515-find-largest-value-in-each-tree-row
0547-number-of-provinces
0684-redundant-connection
0721-accounts-merge
0733-flood-fill
0744-network-delay-time
0794-swim-in-rising-water
0801-is-graph-bipartite
0803-cheapest-flights-within-k-stops
0820-find-eventual-safe-states
0854-making-a-large-island
0871-keys-and-rooms
0896-smallest-subtree-with-all-the-deepest-nodes
0904-leaf-similar-trees
0984-most-stones-removed-with-same-row-or-column
1073-number-of-enclaves
1093-recover-a-tree-from-preorder-traversal
1116-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1300-critical-connections-in-a-network
1350-remove-sub-folders-from-the-filesystem
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1442-number-of-operations-to-make-network-connected
1474-longest-zigzag-path-in-a-binary-tree
1493-frog-position-after-t-seconds
1544-count-good-nodes-in-binary-tree
1558-course-schedule-iv
1576-reorder-routes-to-make-all-paths-lead-to-the-city-zero
1691-minimum-number-of-days-to-disconnect-island
1753-path-with-minimum-effort
2246-maximum-employees-to-be-invited-to-a-meeting
2438-find-closest-node-to-given-two-nodes
2545-height-of-binary-tree-after-subtree-removal-queries
2677-cousins-in-binary-tree-ii
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Breadth-First Search

0112-path-sum
0127-word-ladder
0130-surrounded-regions
0133-clone-graph
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0226-invert-binary-tree
0322-coin-change
0399-evaluate-division
0407-trapping-rain-water-ii
0515-find-largest-value-in-each-tree-row
0542-01-matrix
0547-number-of-provinces
0684-redundant-connection
0721-accounts-merge
0733-flood-fill
0744-network-delay-time
0794-swim-in-rising-water
0801-is-graph-bipartite
0803-cheapest-flights-within-k-stops
0820-find-eventual-safe-states
0854-making-a-large-island
0871-keys-and-rooms
0896-smallest-subtree-with-all-the-deepest-nodes
0945-snakes-and-ladders
1036-rotting-oranges
1073-number-of-enclaves
1116-maximum-level-sum-of-a-binary-tree
1171-shortest-path-in-binary-matrix
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1424-maximum-candies-you-can-get-from-boxes
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1442-number-of-operations-to-make-network-connected
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1493-frog-position-after-t-seconds
1544-count-good-nodes-in-binary-tree
1558-course-schedule-iv
1576-reorder-routes-to-make-all-paths-lead-to-the-city-zero
1691-minimum-number-of-days-to-disconnect-island
1753-path-with-minimum-effort
1876-map-of-highest-peak
2038-nearest-exit-from-entrance-in-maze
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2583-divide-nodes-into-the-maximum-number-of-groups
2588-maximum-number-of-points-from-grid-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Topological Sort

0207-course-schedule
0210-course-schedule-ii
0820-find-eventual-safe-states
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1558-course-schedule-iv
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2246-maximum-employees-to-be-invited-to-a-meeting

Union Find

0128-longest-consecutive-sequence
0130-surrounded-regions
0200-number-of-islands
0399-evaluate-division
0547-number-of-provinces
0684-redundant-connection
0721-accounts-merge
0794-swim-in-rising-water
0801-is-graph-bipartite
0854-making-a-large-island
0984-most-stones-removed-with-same-row-or-column
1058-lexicographically-smallest-equivalent-string
1073-number-of-enclaves
1396-count-servers-that-communicate
1442-number-of-operations-to-make-network-connected
1701-remove-max-number-of-edges-to-keep-graph-fully-traversable
1706-min-cost-to-connect-all-points
1753-path-with-minimum-effort
2583-divide-nodes-into-the-maximum-number-of-groups
2588-maximum-number-of-points-from-grid-queries
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3219-make-lexicographically-smallest-array-by-swapping-elements
3348-minimum-cost-walk-in-weighted-graph

Array

0004-median-of-two-sorted-arrays
0011-container-with-most-water
0031-next-permutation
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0040-combination-sum-ii
0042-trapping-rain-water
0048-rotate-image
0054-spiral-matrix
0057-insert-interval
0063-unique-paths-ii
0064-minimum-path-sum
0073-set-matrix-zeroes
0075-sort-colors
0078-subsets
0079-word-search
0081-search-in-rotated-sorted-array-ii
0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0120-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0128-longest-consecutive-sequence
0130-surrounded-regions
0135-candy
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0188-best-time-to-buy-and-sell-stock-iv
0198-house-robber
0200-number-of-islands
0209-minimum-size-subarray-sum
0213-house-robber-ii
0215-kth-largest-element-in-an-array
0216-combination-sum-iii
0219-contains-duplicate-ii
0229-majority-element-ii
0238-product-of-array-except-self
0300-longest-increasing-subsequence
0303-range-sum-query-immutable
0309-best-time-to-buy-and-sell-stock-with-cooldown
0312-burst-balloons
0322-coin-change
0334-increasing-triplet-subsequence
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0368-largest-divisible-subset
0399-evaluate-division
0406-queue-reconstruction-by-height
0407-trapping-rain-water-ii
0410-split-array-largest-sum
0413-arithmetic-slices
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0452-minimum-number-of-arrows-to-burst-balloons
0455-assign-cookies
0493-reverse-pairs
0494-target-sum
0518-coin-change-ii
0540-single-element-in-a-sorted-array
0542-01-matrix
0560-subarray-sum-equals-k
0605-can-place-flowers
0621-task-scheduler
0632-smallest-range-covering-elements-from-k-lists
0643-maximum-average-subarray-i
0673-number-of-longest-increasing-subsequence
0692-top-k-frequent-words
0698-partition-to-k-equal-sum-subsets
0713-subarray-product-less-than-k
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0721-accounts-merge
0724-find-pivot-index
0733-flood-fill
0739-daily-temperatures
0745-find-smallest-letter-greater-than-target
0747-min-cost-climbing-stairs
0780-max-chunks-to-make-sorted
0792-binary-search
0794-swim-in-rising-water
0797-rabbits-in-forest
0854-making-a-large-island
0870-magic-squares-in-grid
0890-lemonade-change
0907-koko-eating-bananas
0921-spiral-matrix-iii
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0941-sort-array-by-parity
0945-snakes-and-ladders
0952-word-subsets
0966-binary-subarrays-with-sum
0967-minimum-falling-path-sum
1002-maximum-width-ramp
1014-k-closest-points-to-origin
1016-subarray-sums-divisible-by-k
1022-unique-paths-iii
1034-subarrays-with-k-different-integers
1036-rotting-oranges
1046-max-consecutive-ones-iii
1049-minimum-domino-rotations-for-equal-row
1056-capacity-to-ship-packages-within-d-days
1063-best-sightseeing-pair
1073-number-of-enclaves
1111-minimum-score-triangulation-of-polygon
1129-longest-string-chain
1171-shortest-path-in-binary-matrix
1227-number-of-equivalent-domino-pairs
1256-rank-transform-of-an-array
1293-three-consecutive-odds
1319-unique-number-of-occurrences
1350-remove-sub-folders-from-the-filesystem
1364-tuple-with-same-product
1370-count-number-of-nice-subarrays
1392-find-the-difference-of-two-arrays
1396-count-servers-that-communicate
1397-search-suggestions-system
1408-find-the-smallest-divisor-given-a-threshold
1421-find-numbers-with-even-number-of-digits
1424-maximum-candies-you-can-get-from-boxes
1476-count-negative-numbers-in-a-sorted-matrix
1478-maximum-number-of-events-that-can-be-attended
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1499-maximum-performance-of-a-team
1510-find-lucky-integer-in-an-array
1524-string-matching-in-an-array
1528-kids-with-the-greatest-number-of-candies
1538-maximum-points-you-can-obtain-from-cards
1556-make-two-arrays-equal-by-reversing-subarrays
1570-final-prices-with-a-special-discount-in-a-shop
1586-longest-subarray-of-1s-after-deleting-one-element
1604-least-number-of-unique-integers-after-k-removals
1615-range-sum-of-sorted-subarray-sums
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1620-check-if-array-pairs-are-divisible-by-k
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1631-number-of-sub-arrays-with-odd-sum
1646-kth-missing-positive-number
1656-count-good-triplets
1669-minimum-cost-to-cut-a-stick
1691-minimum-number-of-days-to-disconnect-island
1694-make-sum-divisible-by-p
1706-min-cost-to-connect-all-points
1741-sort-array-by-increasing-frequency
1753-path-with-minimum-effort
1776-minimum-operations-to-reduce-x-to-zero
1798-max-number-of-k-sum-pairs
1819-construct-the-lexicographically-largest-valid-sequence
1833-find-the-highest-altitude
1849-maximum-absolute-sum-of-any-subarray
1851-maximum-number-of-events-that-can-be-attended-ii
1876-map-of-highest-peak
1878-check-if-array-is-sorted-and-rotated
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1917-maximum-average-pass-ratio
1923-sentence-similarity-iii
1927-maximum-ascending-subarray-sum
1940-maximum-xor-for-each-query
1951-find-the-winner-of-the-circular-game
1993-sum-of-all-subset-xor-totals
1995-finding-pairs-with-a-certain-sum
2038-nearest-exit-from-entrance-in-maze
2048-build-array-from-permutation
2054-the-number-of-the-smallest-unoccupied-chair
2094-remove-stones-to-minimize-the-total
2107-find-unique-binary-string
2144-maximum-difference-between-increasing-elements
2145-grid-game
2150-kth-smallest-product-of-two-sorted-arrays
2160-minimum-operations-to-make-a-uni-value-grid
2162-partition-array-into-two-arrays-to-minimize-sum-difference
2163-kth-distinct-string-in-an-array
2170-count-number-of-maximum-bitwise-or-subsets
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2227-sum-of-subarray-ranges
2237-longest-palindrome-by-concatenating-two-letter-words
2249-count-the-hidden-sequences
2255-minimum-swaps-to-group-all-1s-together-ii
2262-solving-questions-with-brainpower
2265-partition-array-according-to-given-pivot
2271-rearrange-array-elements-by-sign
2277-count-equal-and-divisible-pairs-in-an-array
2280-count-good-triplets-in-an-array
2292-counting-words-with-a-given-prefix
2320-find-all-k-distant-indices-in-an-array
2324-find-triangular-sum-of-an-array
2356-largest-combination-with-bitwise-and-greater-than-zero
2358-number-of-ways-to-split-array
2387-partition-array-such-that-maximum-difference-is-k
2392-successful-pairs-of-spells-and-potions
2394-count-subarrays-with-score-less-than-k
2428-equal-row-and-column-pairs
2448-count-number-of-bad-pairs
2478-longest-nice-subarray
2488-divide-intervals-into-minimum-number-of-groups
2497-maximum-matching-of-players-with-trainers
2498-smallest-subarrays-with-maximum-bitwise-or
2527-count-subarrays-with-fixed-bounds
2533-bitwise-xor-of-all-pairings
2545-height-of-binary-tree-after-subtree-removal-queries
2551-apply-operations-to-an-array
2553-total-cost-to-hire-k-workers
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2588-maximum-number-of-points-from-grid-queries
2616-maximal-score-after-applying-k-operations
2626-count-the-number-of-good-subarrays
2636-maximum-subsequence-score
2681-put-marbles-in-bags
2685-first-completely-painted-row-or-column
2691-count-vowel-strings-in-ranges
2699-count-the-number-of-fair-pairs
2720-minimize-the-maximum-difference-of-pairs
2727-number-of-senior-citizens
2728-sum-in-a-matrix
2764-maximum-number-of-fish-in-a-grid
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
2808-painting-the-walls
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
3001-apply-operations-to-maximize-score
3080-split-array-into-maximum-number-of-subarrays
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3152-maximum-value-of-an-ordered-triplet-ii
3154-maximum-value-of-an-ordered-triplet-i
3181-find-building-where-alice-and-bob-can-meet
3213-count-subarrays-where-max-element-appears-at-least-k-times
3219-make-lexicographically-smallest-array-by-swapping-elements
3236-smallest-missing-integer-greater-than-sequential-prefix-sum
3241-divide-array-into-arrays-with-max-difference
3278-find-the-number-of-ways-to-place-people-i
3305-count-prefix-and-suffix-pairs-ii
3309-count-prefix-and-suffix-pairs-i
3332-minimum-operations-to-exceed-threshold-value-ii
3348-minimum-cost-walk-in-weighted-graph
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3429-special-array-i
3430-count-days-without-meetings
3434-find-the-number-of-distinct-colors-among-the-balls
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3555-final-array-state-after-k-multiplication-operations-i
3621-minimum-operations-to-make-array-values-equal-to-k
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3657-check-if-grid-can-be-cut-into-sections
3743-reschedule-meetings-for-maximum-free-time-i
3747-maximum-difference-between-adjacent-elements-in-a-circular-array

Stack

0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0094-binary-tree-inorder-traversal
0144-binary-tree-preorder-traversal
0394-decode-string
0678-valid-parenthesis-string
0739-daily-temperatures
0780-max-chunks-to-make-sorted
0937-online-stock-span
0957-minimum-add-to-make-parentheses-valid
1002-maximum-width-ramp
1197-parsing-a-boolean-expression
1570-final-prices-with-a-special-discount-in-a-shop
2021-remove-all-occurrences-of-a-substring
2095-minimum-number-of-swaps-to-make-the-string-balanced
2227-sum-of-subarray-ranges
2236-maximum-twin-sum-of-a-linked-list
2470-removing-stars-from-a-string
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2800-minimum-string-length-after-removing-substrings
3001-apply-operations-to-maximize-score
3181-find-building-where-alice-and-bob-can-meet
3447-clear-digits

Monotonic Stack

0042-trapping-rain-water
0084-largest-rectangle-in-histogram
0085-maximal-rectangle
0739-daily-temperatures
0780-max-chunks-to-make-sorted
0937-online-stock-span
1002-maximum-width-ramp
1570-final-prices-with-a-special-discount-in-a-shop
2227-sum-of-subarray-ranges
3001-apply-operations-to-maximize-score
3181-find-building-where-alice-and-bob-can-meet

Dynamic Programming

0005-longest-palindromic-substring
0022-generate-parentheses
0042-trapping-rain-water
0062-unique-paths
0063-unique-paths-ii
0064-minimum-path-sum
0070-climbing-stairs
0072-edit-distance
0085-maximal-rectangle
0095-unique-binary-search-trees-ii
0115-distinct-subsequences
0120-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0152-maximum-product-subarray
0188-best-time-to-buy-and-sell-stock-iv
0198-house-robber
0213-house-robber-ii
0241-different-ways-to-add-parentheses
0300-longest-increasing-subsequence
0309-best-time-to-buy-and-sell-stock-with-cooldown
0312-burst-balloons
0322-coin-change
0337-house-robber-iii
0338-counting-bits
0368-largest-divisible-subset
0392-is-subsequence
0410-split-array-largest-sum
0413-arithmetic-slices
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0494-target-sum
0516-longest-palindromic-subsequence
0518-coin-change-ii
0542-01-matrix
0583-delete-operation-for-two-strings
0673-number-of-longest-increasing-subsequence
0678-valid-parenthesis-string
0698-partition-to-k-equal-sum-subsets
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0747-min-cost-climbing-stairs
0803-cheapest-flights-within-k-stops
0967-minimum-falling-path-sum
1063-best-sightseeing-pair
1111-minimum-score-triangulation-of-polygon
1129-longest-string-chain
1170-shortest-common-supersequence
1236-n-th-tribonacci-number
1250-longest-common-subsequence
1437-minimum-insertion-steps-to-make-a-string-palindrome
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1474-longest-zigzag-path-in-a-binary-tree
1586-longest-subarray-of-1s-after-deleting-one-element
1631-number-of-sub-arrays-with-odd-sum
1669-minimum-cost-to-cut-a-stick
1849-maximum-absolute-sum-of-any-subarray
1851-maximum-number-of-events-that-can-be-attended-ii
2028-the-earliest-and-latest-rounds-where-players-compete
2090-number-of-ways-to-arrive-at-destination
2162-partition-array-into-two-arrays-to-minimize-sum-difference
2262-solving-questions-with-brainpower
2395-longest-binary-subsequence-less-than-or-equal-to-k
2415-count-the-number-of-ideal-arrays
2554-minimum-total-distance-traveled
2586-longest-square-streak-in-an-array
2808-painting-the-walls
3142-longest-unequal-adjacent-groups-subsequence-ii
3143-longest-unequal-adjacent-groups-subsequence-i
3243-count-the-number-of-powerful-integers
3618-find-the-original-typed-string-ii
3629-total-characters-in-string-after-transformations-i
3637-count-number-of-balanced-permutations

Matrix

0048-rotate-image
0054-spiral-matrix
0063-unique-paths-ii
0064-minimum-path-sum
0073-set-matrix-zeroes
0079-word-search
0085-maximal-rectangle
0130-surrounded-regions
0200-number-of-islands
0407-trapping-rain-water-ii
0542-01-matrix
0733-flood-fill
0794-swim-in-rising-water
0854-making-a-large-island
0870-magic-squares-in-grid
0921-spiral-matrix-iii
0945-snakes-and-ladders
0967-minimum-falling-path-sum
1022-unique-paths-iii
1036-rotting-oranges
1073-number-of-enclaves
1171-shortest-path-in-binary-matrix
1396-count-servers-that-communicate
1476-count-negative-numbers-in-a-sorted-matrix
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1691-minimum-number-of-days-to-disconnect-island
1753-path-with-minimum-effort
1876-map-of-highest-peak
2038-nearest-exit-from-entrance-in-maze
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2428-equal-row-and-column-pairs
2588-maximum-number-of-points-from-grid-queries
2685-first-completely-painted-row-or-column
2728-sum-in-a-matrix
2764-maximum-number-of-fish-in-a-grid
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Hash Table

0003-longest-substring-without-repeating-characters
0017-letter-combinations-of-a-phone-number
0073-set-matrix-zeroes
0076-minimum-window-substring
0127-word-ladder
0128-longest-consecutive-sequence
0133-clone-graph
0187-repeated-dna-sequences
0208-implement-trie-prefix-tree
0219-contains-duplicate-ii
0229-majority-element-ii
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0395-longest-substring-with-at-least-k-repeating-characters
0398-random-pick-index
0424-longest-repeating-character-replacement
0451-sort-characters-by-frequency
0560-subarray-sum-equals-k
0567-permutation-in-string
0621-task-scheduler
0632-smallest-range-covering-elements-from-k-lists
0692-top-k-frequent-words
0721-accounts-merge
0768-partition-labels
0797-rabbits-in-forest
0870-magic-squares-in-grid
0889-buddy-strings
0896-smallest-subtree-with-all-the-deepest-nodes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0952-word-subsets
0966-binary-subarrays-with-sum
0984-most-stones-removed-with-same-row-or-column
1016-subarray-sums-divisible-by-k
1034-subarrays-with-k-different-integers
1129-longest-string-chain
1218-lowest-common-ancestor-of-deepest-leaves
1227-number-of-equivalent-domino-pairs
1256-rank-transform-of-an-array
1319-unique-number-of-occurrences
1364-tuple-with-same-product
1370-count-number-of-nice-subarrays
1387-find-elements-in-a-contaminated-binary-tree
1392-find-the-difference-of-two-arrays
1460-number-of-substrings-containing-all-three-characters
1473-find-the-longest-substring-containing-vowels-in-even-counts
1500-count-largest-group
1502-construct-k-palindrome-strings
1510-find-lucky-integer-in-an-array
1556-make-two-arrays-equal-by-reversing-subarrays
1604-least-number-of-unique-integers-after-k-removals
1620-check-if-array-pairs-are-divisible-by-k
1668-find-longest-awesome-substring
1694-make-sum-divisible-by-p
1715-split-a-string-into-the-max-number-of-unique-substrings
1741-sort-array-by-increasing-frequency
1776-minimum-operations-to-reduce-x-to-zero
1777-determine-if-two-strings-are-close
1798-max-number-of-k-sum-pairs
1915-check-if-one-string-swap-can-make-strings-equal
1995-finding-pairs-with-a-certain-sum
2044-number-of-wonderful-substrings
2054-the-number-of-the-smallest-unoccupied-chair
2059-unique-length-3-palindromic-subsequences
2107-find-unique-binary-string
2163-kth-distinct-string-in-an-array
2215-finding-3-digit-even-numbers
2220-find-all-possible-recipes-from-given-supplies
2237-longest-palindrome-by-concatenating-two-letter-words
2300-construct-string-with-repeat-limit
2356-largest-combination-with-bitwise-and-greater-than-zero
2413-smallest-number-in-infinite-set
2428-equal-row-and-column-pairs
2434-design-a-number-container-system
2448-count-number-of-bad-pairs
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2626-count-the-number-of-good-subarrays
2677-cousins-in-binary-tree-ii
2685-first-completely-painted-row-or-column
2766-find-the-prefix-common-array-of-two-arrays
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
3236-smallest-missing-integer-greater-than-sequential-prefix-sum
3276-minimum-number-of-pushes-to-type-word-ii
3360-minimum-deletions-to-make-string-k-special
3395-minimum-length-of-anagram-concatenation
3434-find-the-number-of-distinct-colors-among-the-balls
3455-minimum-length-of-string-after-operations
3548-find-the-count-of-good-integers
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3621-minimum-operations-to-make-array-values-equal-to-k
3629-total-characters-in-string-after-transformations-i
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes

Sliding Window

0003-longest-substring-without-repeating-characters
0076-minimum-window-substring
0187-repeated-dna-sequences
0209-minimum-size-subarray-sum
0219-contains-duplicate-ii
0395-longest-substring-with-at-least-k-repeating-characters
0413-arithmetic-slices
0424-longest-repeating-character-replacement
0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
0643-maximum-average-subarray-i
0713-subarray-product-less-than-k
0966-binary-subarrays-with-sum
1034-subarrays-with-k-different-integers
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1460-number-of-substrings-containing-all-three-characters
1538-maximum-points-you-can-obtain-from-cards
1567-maximum-number-of-vowels-in-a-substring-of-given-length
1586-longest-subarray-of-1s-after-deleting-one-element
1776-minimum-operations-to-reduce-x-to-zero
1967-longest-substring-of-all-vowels-in-order
2255-minimum-swaps-to-group-all-1s-together-ii
2394-count-subarrays-with-score-less-than-k
2478-longest-nice-subarray
2498-smallest-subarrays-with-maximum-bitwise-or
2527-count-subarrays-with-fixed-bounds
2626-count-the-number-of-good-subarrays
2856-count-complete-subarrays-in-an-array
3213-count-subarrays-where-max-element-appears-at-least-k-times
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3743-reschedule-meetings-for-maximum-free-time-i
3761-maximum-difference-between-even-and-odd-frequency-ii

Binary Search

0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0069-sqrtx
0081-search-in-rotated-sorted-array-ii
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0209-minimum-size-subarray-sum
0278-first-bad-version
0300-longest-increasing-subsequence
0350-intersection-of-two-arrays-ii
0374-guess-number-higher-or-lower
0410-split-array-largest-sum
0493-reverse-pairs
0540-single-element-in-a-sorted-array
0668-kth-smallest-number-in-multiplication-table
0713-subarray-product-less-than-k
0745-find-smallest-letter-greater-than-target
0792-binary-search
0794-swim-in-rising-water
0907-koko-eating-bananas
1046-max-consecutive-ones-iii
1056-capacity-to-ship-packages-within-d-days
1307-ugly-number-iii
1397-search-suggestions-system
1408-find-the-smallest-divisor-given-a-threshold
1476-count-negative-numbers-in-a-sorted-matrix
1615-range-sum-of-sorted-subarray-sums
1621-number-of-subsequences-that-satisfy-the-given-sum-condition
1646-kth-missing-positive-number
1753-path-with-minimum-effort
1776-minimum-operations-to-reduce-x-to-zero
1851-maximum-number-of-events-that-can-be-attended-ii
2150-kth-smallest-product-of-two-sorted-arrays
2162-partition-array-into-two-arrays-to-minimize-sum-difference
2280-count-good-triplets-in-an-array
2392-successful-pairs-of-spells-and-potions
2394-count-subarrays-with-score-less-than-k
2498-smallest-subarrays-with-maximum-bitwise-or
2586-longest-square-streak-in-an-array
2699-count-the-number-of-fair-pairs
2720-minimize-the-maximum-difference-of-pairs
3181-find-building-where-alice-and-bob-can-meet

Linked List

0109-convert-sorted-list-to-binary-search-tree
0328-odd-even-linked-list
2182-find-the-minimum-and-maximum-number-of-nodes-between-critical-points
2216-delete-the-middle-node-of-a-linked-list
2236-maximum-twin-sum-of-a-linked-list
2299-merge-nodes-in-between-zeros

Simulation

0054-spiral-matrix
0921-spiral-matrix-iii
1642-water-bottles
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game
2021-remove-all-occurrences-of-a-substring
2048-build-array-from-permutation
2260-divide-a-string-into-groups-of-size-k
2265-partition-array-according-to-given-pivot
2271-rearrange-array-elements-by-sign
2299-merge-nodes-in-between-zeros
2324-find-triangular-sum-of-an-array
2428-equal-row-and-column-pairs
2470-removing-stars-from-a-string
2551-apply-operations-to-an-array
2553-total-cost-to-hire-k-workers
2645-pass-the-pillow
2728-sum-in-a-matrix
2800-minimum-string-length-after-removing-substrings
2857-total-distance-traveled
3332-minimum-operations-to-exceed-threshold-value-ii
3336-water-bottles-ii
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits
3555-final-array-state-after-k-multiplication-operations-i
3600-find-the-k-th-character-in-string-game-i

Math

0048-rotate-image
0050-powx-n
0062-unique-paths
0069-sqrtx
0070-climbing-stairs
0231-power-of-two
0241-different-ways-to-add-parentheses
0273-integer-to-english-words
0342-power-of-four
0368-largest-divisible-subset
0398-random-pick-index
0668-kth-smallest-number-in-multiplication-table
0670-maximum-swap
0797-rabbits-in-forest
0870-magic-squares-in-grid
1014-k-closest-points-to-origin
1033-broken-calculator
1146-greatest-common-divisor-of-strings
1236-n-th-tribonacci-number
1307-ugly-number-iii
1370-count-number-of-nice-subarrays
1421-find-numbers-with-even-number-of-digits
1500-count-largest-group
1529-max-difference-you-can-get-from-changing-an-integer
1631-number-of-sub-arrays-with-odd-sum
1642-water-bottles
1889-check-if-number-is-a-sum-of-powers-of-three
1951-find-the-winner-of-the-circular-game
1993-sum-of-all-subset-xor-totals
2050-count-good-numbers
2160-minimum-operations-to-make-a-uni-value-grid
2202-sum-of-k-mirror-numbers
2324-find-triangular-sum-of-an-array
2415-count-the-number-of-ideal-arrays
2448-count-number-of-bad-pairs
2645-pass-the-pillow
2704-maximum-difference-by-remapping-a-digit
2802-find-the-punishment-number-of-an-integer
2857-total-distance-traveled
2998-count-symmetric-integers
3001-apply-operations-to-maximize-score
3172-divisible-and-non-divisible-sums-difference
3243-count-the-number-of-powerful-integers
3278-find-the-number-of-ways-to-place-people-i
3336-water-bottles-ii
3548-find-the-count-of-good-integers
3555-final-array-state-after-k-multiplication-operations-i
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii
3629-total-characters-in-string-after-transformations-i
3637-count-number-of-balanced-permutations
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements
3754-maximum-manhattan-distance-after-k-changes
3830-find-closest-person

Recursion

0050-powx-n
0231-power-of-two
0241-different-ways-to-add-parentheses
0273-integer-to-english-words
0342-power-of-four
0394-decode-string
1197-parsing-a-boolean-expression
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game
2050-count-good-numbers
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii

Queue

0649-dota2-senate
0969-number-of-recent-calls
1951-find-the-winner-of-the-circular-game
2527-count-subarrays-with-fixed-bounds
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Prefix Sum

0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0303-range-sum-query-immutable
0410-split-array-largest-sum
0560-subarray-sum-equals-k
0713-subarray-product-less-than-k
0724-find-pivot-index
0966-binary-subarrays-with-sum
1016-subarray-sums-divisible-by-k
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1473-find-the-longest-substring-containing-vowels-in-even-counts
1537-maximum-score-after-splitting-a-string
1538-maximum-points-you-can-obtain-from-cards
1631-number-of-sub-arrays-with-odd-sum
1694-make-sum-divisible-by-p
1776-minimum-operations-to-reduce-x-to-zero
1833-find-the-highest-altitude
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1940-maximum-xor-for-each-query
2044-number-of-wonderful-substrings
2059-unique-length-3-palindromic-subsequences
2145-grid-game
2249-count-the-hidden-sequences
2358-number-of-ways-to-split-array
2394-count-subarrays-with-score-less-than-k
2488-divide-intervals-into-minimum-number-of-groups
2691-count-vowel-strings-in-ranges
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3618-find-the-original-typed-string-ii
3761-maximum-difference-between-even-and-odd-frequency-ii

Counting

0229-majority-element-ii
0347-top-k-frequent-elements
0451-sort-characters-by-frequency
0621-task-scheduler
0692-top-k-frequent-words
1034-subarrays-with-k-different-integers
1227-number-of-equivalent-domino-pairs
1364-tuple-with-same-product
1396-count-servers-that-communicate
1502-construct-k-palindrome-strings
1510-find-lucky-integer-in-an-array
1604-least-number-of-unique-integers-after-k-removals
1620-check-if-array-pairs-are-divisible-by-k
1777-determine-if-two-strings-are-close
1915-check-if-one-string-swap-can-make-strings-equal
2163-kth-distinct-string-in-an-array
2237-longest-palindrome-by-concatenating-two-letter-words
2300-construct-string-with-repeat-limit
2356-largest-combination-with-bitwise-and-greater-than-zero
2448-count-number-of-bad-pairs
3276-minimum-number-of-pushes-to-type-word-ii
3360-minimum-deletions-to-make-string-k-special
3395-minimum-length-of-anagram-concatenation
3455-minimum-length-of-string-after-operations
3629-total-characters-in-string-after-transformations-i
3753-maximum-difference-between-even-and-odd-frequency-i
3754-maximum-manhattan-distance-after-k-changes

Strongly Connected Component

1691-minimum-number-of-days-to-disconnect-island

Tree

0094-binary-tree-inorder-traversal
0095-unique-binary-search-trees-ii
0109-convert-sorted-list-to-binary-search-tree
0112-path-sum
0129-sum-root-to-leaf-numbers
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0226-invert-binary-tree
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0337-house-robber-iii
0437-path-sum-iii
0450-delete-node-in-a-bst
0515-find-largest-value-in-each-tree-row
0783-search-in-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0896-smallest-subtree-with-all-the-deepest-nodes
0904-leaf-similar-trees
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1116-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1474-longest-zigzag-path-in-a-binary-tree
1493-frog-position-after-t-seconds
1544-count-good-nodes-in-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii
3633-maximize-the-number-of-target-nodes-after-connecting-trees-i

Design

0208-implement-trie-prefix-tree
0303-range-sum-query-immutable
0789-kth-largest-element-in-a-stream
0937-online-stock-span
0969-number-of-recent-calls
1387-find-elements-in-a-contaminated-binary-tree
1995-finding-pairs-with-a-certain-sum
2413-smallest-number-in-infinite-set
2434-design-a-number-container-system

Binary Search Tree

0095-unique-binary-search-trees-ii
0109-convert-sorted-list-to-binary-search-tree
0235-lowest-common-ancestor-of-a-binary-search-tree
0450-delete-node-in-a-bst
0783-search-in-a-binary-search-tree
0789-kth-largest-element-in-a-stream

Binary Tree

0094-binary-tree-inorder-traversal
0095-unique-binary-search-trees-ii
0109-convert-sorted-list-to-binary-search-tree
0112-path-sum
0129-sum-root-to-leaf-numbers
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0226-invert-binary-tree
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0337-house-robber-iii
0437-path-sum-iii
0450-delete-node-in-a-bst
0515-find-largest-value-in-each-tree-row
0783-search-in-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0896-smallest-subtree-with-all-the-deepest-nodes
0904-leaf-similar-trees
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1093-recover-a-tree-from-preorder-traversal
1116-maximum-level-sum-of-a-binary-tree
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1474-longest-zigzag-path-in-a-binary-tree
1544-count-good-nodes-in-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Data Stream

0789-kth-largest-element-in-a-stream
0937-online-stock-span
0969-number-of-recent-calls

Backtracking

0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0040-combination-sum-ii
0078-subsets
0079-word-search
0095-unique-binary-search-trees-ii
0216-combination-sum-iii
0494-target-sum
0698-partition-to-k-equal-sum-subsets
1022-unique-paths-iii
1715-split-a-string-into-the-max-number-of-unique-substrings
1819-construct-the-lexicographically-largest-valid-sequence
1993-sum-of-all-subset-xor-totals
2107-find-unique-binary-string
2170-count-number-of-maximum-bitwise-or-subsets
2802-find-the-punishment-number-of-an-integer

Shortest Path

0399-evaluate-division
0744-network-delay-time
0803-cheapest-flights-within-k-stops
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2090-number-of-ways-to-arrive-at-destination
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Biconnected Component

1300-critical-connections-in-a-network

Divide and Conquer

0004-median-of-two-sorted-arrays
0109-convert-sorted-list-to-binary-search-tree
0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
0395-longest-substring-with-at-least-k-repeating-characters
0493-reverse-pairs
0925-construct-binary-tree-from-preorder-and-postorder-traversal
1014-k-closest-points-to-origin
2280-count-good-triplets-in-an-array

Binary Indexed Tree

0406-queue-reconstruction-by-height
0493-reverse-pairs
0673-number-of-longest-increasing-subsequence
2280-count-good-triplets-in-an-array
3181-find-building-where-alice-and-bob-can-meet

Segment Tree

0406-queue-reconstruction-by-height
0493-reverse-pairs
0673-number-of-longest-increasing-subsequence
2280-count-good-triplets-in-an-array
3181-find-building-where-alice-and-bob-can-meet

Merge Sort

0493-reverse-pairs
2280-count-good-triplets-in-an-array

Ordered Set

0493-reverse-pairs
2162-partition-array-into-two-arrays-to-minimize-sum-difference
2280-count-good-triplets-in-an-array
2413-smallest-number-in-infinite-set
2434-design-a-number-container-system

Memoization

0070-climbing-stairs
0241-different-ways-to-add-parentheses
0698-partition-to-k-equal-sum-subsets
1236-n-th-tribonacci-number
2028-the-earliest-and-latest-rounds-where-players-compete
2395-longest-binary-subsequence-less-than-or-equal-to-k

Combinatorics

0062-unique-paths
1307-ugly-number-iii
1993-sum-of-all-subset-xor-totals
2324-find-triangular-sum-of-an-array
2415-count-the-number-of-ideal-arrays
3548-find-the-count-of-good-integers
3637-count-number-of-balanced-permutations
3682-count-the-number-of-arrays-with-k-matching-adjacent-elements

Bit Manipulation

0078-subsets
0187-repeated-dna-sequences
0231-power-of-two
0338-counting-bits
0342-power-of-four
0698-partition-to-k-equal-sum-subsets
1022-unique-paths-iii
1441-minimum-flips-to-make-a-or-b-equal-to-c
1473-find-the-longest-substring-containing-vowels-in-even-counts
1668-find-longest-awesome-substring
1940-maximum-xor-for-each-query
1993-sum-of-all-subset-xor-totals
2044-number-of-wonderful-substrings
2059-unique-length-3-palindromic-subsequences
2162-partition-array-into-two-arrays-to-minimize-sum-difference
2170-count-number-of-maximum-bitwise-or-subsets
2356-largest-combination-with-bitwise-and-greater-than-zero
2478-longest-nice-subarray
2498-smallest-subarrays-with-maximum-bitwise-or
2533-bitwise-xor-of-all-pairings
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
3080-split-array-into-maximum-number-of-subarrays
3348-minimum-cost-walk-in-weighted-graph
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3600-find-the-k-th-character-in-string-game-i
3601-find-the-k-th-character-in-string-game-ii

Bitmask

0698-partition-to-k-equal-sum-subsets
2162-partition-array-into-two-arrays-to-minimize-sum-difference

Enumeration

1656-count-good-triplets
1993-sum-of-all-subset-xor-totals
2170-count-number-of-maximum-bitwise-or-subsets
2202-sum-of-k-mirror-numbers
2215-finding-3-digit-even-numbers
2998-count-symmetric-integers
3278-find-the-number-of-ways-to-place-people-i
3548-find-the-count-of-good-integers
3761-maximum-difference-between-even-and-odd-frequency-ii

Trie

0208-implement-trie-prefix-tree
0386-lexicographical-numbers
0440-k-th-smallest-in-lexicographical-order
0692-top-k-frequent-words
1350-remove-sub-folders-from-the-filesystem
1397-search-suggestions-system
3305-count-prefix-and-suffix-pairs-ii
3309-count-prefix-and-suffix-pairs-i

String Matching

1524-string-matching-in-an-array
2292-counting-words-with-a-given-prefix
3305-count-prefix-and-suffix-pairs-ii
3309-count-prefix-and-suffix-pairs-i

Rolling Hash

0187-repeated-dna-sequences
3305-count-prefix-and-suffix-pairs-ii
3309-count-prefix-and-suffix-pairs-i

Hash Function

0187-repeated-dna-sequences
3305-count-prefix-and-suffix-pairs-ii
3309-count-prefix-and-suffix-pairs-i

Brainteaser

2533-bitwise-xor-of-all-pairings

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements
1014-k-closest-points-to-origin

Bucket Sort

0347-top-k-frequent-elements
0451-sort-characters-by-frequency
0692-top-k-frequent-words

Interactive

0278-first-bad-version
0374-guess-number-higher-or-lower

Number Theory

1307-ugly-number-iii
2415-count-the-number-of-ideal-arrays
3001-apply-operations-to-maximize-score

Monotonic Queue

2527-count-subarrays-with-fixed-bounds

Minimum Spanning Tree

1706-min-cost-to-connect-all-points

Geometry

1014-k-closest-points-to-origin
3278-find-the-number-of-ways-to-place-people-i

Reservoir Sampling

0398-random-pick-index

Randomized

0398-random-pick-index