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You can find my solutions for the most 50 common LeetCode problems, which I used to practice a while ago.

I believe that's a cool idea to share my experience and such materials here for those who are practicing coding interview.

Hope you find it useful :)

list of problems:



# LeetCode ID Title Level URL
0 160 Intersection of Two Linked Lists Easy https://leetcode.com/problems/intersection-of-two-linked-lists/
1 350 Intersection of Two Arrays II Easy https://leetcode.com/problems/intersection-of-two-arrays-ii/
2 141 Linked List Cycle Easy https://leetcode.com/problems/linked-list-cycle/
3 217 Contains Duplicate Easy https://leetcode.com/problems/contains-duplicate/
4 387 First Unique Character in a String Easy https://leetcode.com/problems/first-unique-character-in-a-string/
5 121 Best Time to Buy and Sell Stock Easy https://leetcode.com/problems/best-time-to-buy-and-sell-stock/
6 235 Lowest Common Ancestor of a Binary Search Tree Easy https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/
7 237 Delete Node in a Linked List Easy https://leetcode.com/problems/delete-node-in-a-linked-list/
8 20 Valid Parentheses Easy https://leetcode.com/problems/valid-parentheses/
9 283 Move Zeroes Easy https://leetcode.com/problems/move-zeroes/
10 70 Climbing Stairs Easy https://leetcode.com/problems/climbing-stairs/
11 268 Missing Number Easy https://leetcode.com/problems/missing-number/
12 122 Best Time to Buy and Sell Stock II Easy https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/
13 108 Convert a Sorted Array to a BST Easy https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/
14 191 Number of 1 Bits Easy https://leetcode.com/problems/number-of-1-bits/
15 169 Majority Element Easy https://leetcode.com/problems/majority-element/
16 101 Symmetric Tree Easy https://leetcode.com/problems/symmetric-tree/
17 412 Fizz Buzz Easy https://leetcode.com/problems/fizz-buzz/
18 189 Rotate Array Easy https://leetcode.com/problems/rotate-array/
19 543 Diameter of Binary Tree Easy https://leetcode.com/problems/diameter-of-binary-tree/
20 242 Valid Anagram Easy https://leetcode.com/problems/valid-anagram/
21 234 Palindrome Linked List Easy https://leetcode.com/problems/palindrome-linked-list/
22 145 Binary tree Postorder Traversal Hard https://leetcode.com/problems/binary-tree-postorder-traversal/
23 79 Word search Medium https://leetcode.com/problems/word-search/
24 102 Binary Tree Level Order Traversal Medium https://leetcode.com/problems/binary-tree-level-order-traversal/
25 287 Find the Duplicate Number Medium https://leetcode.com/problems/find-the-duplicate-number/
26 215 Kth Largest Element in an Array Medium https://leetcode.com/problems/kth-largest-element-in-an-array/
27 179 Largest Number Medium https://leetcode.com/problems/largest-number/
28 378 Kth Smallest Element in a Sorted Matrix Medium https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/
29 200 Number of Islands Medium https://leetcode.com/problems/number-of-islands/
30 11 Container With Most Water Medium https://leetcode.com/problems/container-with-most-water/
31 236 Lowest Common Ancestor of a Binary Tree Medium https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree/
32 240 Search a 2D Matrix II Medium https://leetcode.com/problems/search-a-2d-matrix-ii/
33 347 Top K Frequent Elements Medium https://leetcode.com/problems/top-k-frequent-elements/
34 230 Kth Smallest Element in a BST Medium https://leetcode.com/problems/kth-smallest-element-in-a-bst/
35 2 Add Two Numbers Medium https://leetcode.com/problems/add-two-numbers/
36 48 Rotate Image Medium https://leetcode.com/problems/rotate-image/
37 152 Maximum Product Subarray Medium https://leetcode.com/problems/maximum-product-subarray/
38 454 4Sum II Medium https://leetcode.com/problems/4sum-ii/
39 56 Merge Intervals Medium https://leetcode.com/problems/merge-intervals/
40 73 Set matrix zero Medium https://leetcode.com/problems/set-matrix-zeroes/
41 238 Product of Array Except Self Medium https://leetcode.com/problems/product-of-array-except-self/
42 94 Binary Tree Inorder Traversal Medium https://leetcode.com/problems/binary-tree-inorder-traversal/
43 49 Group Anagrams Medium https://leetcode.com/problems/group-anagrams/
44 144 Binary Tree Preorder Traversal Medium https://leetcode.com/problems/binary-tree-preorder-traversal/
45 22 Generate Parentheses Medium https://leetcode.com/problems/generate-parentheses/
46 150 Evaluate Reverse Polish Notation Medium https://leetcode.com/problems/evaluate-reverse-polish-notation/
47 62 Unique Paths Medium https://leetcode.com/problems/unique-paths/
48 322 Coin Change Medium https://leetcode.com/problems/coin-change/
49 15 3Sum Medium https://leetcode.com/problems/3sum/