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Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5, Return 阅读全文
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Invert a binary tree. to Trivia: This problem was inspired by this original tweet by Max Howell: 阅读全文
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Given a non-negative number represented as an array of digits, plus one to the number. The digits are stored such that the most significant digit is a 阅读全文
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Write a function to find the longest common prefix string amongst an array of strings. 阅读全文
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You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single 阅读全文
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Given two binary strings, return their sum (also a binary string). For example, a = "11" b = "1" Return "100". 阅读全文
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Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string. If the last word 阅读全文
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排序方法： 测试main函数： 方法对比： B是真数(0-9)， R是基数(个十百) 阅读全文
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Given a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequence of one or more dictionary words. For 阅读全文
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You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo 阅读全文