Implement Trie (Prefix Tree): A trie (pronounced as “try”) or prefix tree is a tree data structure used to efficiently store and retrieve keys in a dataset of strings.
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Minimum Size Subarray Sum: Given an array of positive integers nums and a positive integer target, return the minimal length of a subarray whose sum is greater than or equal to target.
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Permutation in String: Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise.
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Pow(x, n): Implement pow(x, n), which calculates x raised to the power n (i.
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LRU Cache: Design a data structure that follows the constraints of a Least Recently Used (LRU) cache .
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Rotate List: Given the head of a linked list, rotate the list to the right by k places.
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