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Given a non-empty binary tree, find the maximum path sum.For this problem, a path is defined as any sequence of nodes from some starting node to any n 阅读全文
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Given a 2D board and a word, find if the word exists in the grid.The word can be constructed from letters of sequentially adjacent cell, where "adjace 阅读全文
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Given a char array representing tasks CPU need to do. It contains capital letters A to Z where different letters represent different tasks.Tasks could 阅读全文
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Given a grid where each entry is only 0 or 1, find the number of corner rectangles.A corner rectangle is 4 distinct 1s on the grid that form an axis-a 阅读全文
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There are N children standing in a line. Each child is assigned a rating value.You are giving candies to these children subjected to the following req 阅读全文
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Given an unsorted integer array, find the smallest missing positive integer.Example 1:Input: [1,2,0]Output: 3Example 2:Input: [3,4,-1,1]Output: 2Examp 阅读全文