Binary searchhttps://binarysearch.com/problems/K-Distinct-Groups/solutions/26641752 pointerhttps://binarysearch.com/problems/Number-of-Operations-to-Decrement-Target-to-Zero4 directional grid pathhttps://binarysearch.com/problems/Trail-to-Minimize-EffortGFGhttps://www.geeksforgeeks.org/minimum-cost-path-left-right-bottom-moves-allowed/