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Implement strStr(). Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Example 1: Example 2: 使用K 阅读全文
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Given a non-empty integer array, find the minimum number of moves required to make all array elements equal, where a move is incrementing a selected e 阅读全文
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Given a string S, we can transform every letter individually to be lowercase or uppercase to create another string. Return a list of all possible stri 阅读全文
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Given a Binary Search Tree (BST) with the root node root, return the minimum difference between the values of any two different nodes in the tree. Exa 阅读全文
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Given the root of a tree, you are asked to find the most frequent subtree sum. The subtree sum of a node is defined as the sum of all the node values 阅读全文
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Given a list of directory info including directory path, and all the files with contents in this directory, you need to find out all the groups of dup 阅读全文
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Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two elements 阅读全文