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摘要： 题目描述 Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. 题目大意 给一个区间[m, n]，求该区间内所有元素按 阅读全文

摘要： 题目描述 Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting ad 阅读全文

摘要： 题目描述 Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom. 题目 阅读全文

摘要： 题目描述 You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stoppi 阅读全文

摘要： 题目描述 All DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for example: "ACGAATTCCG". When studying DNA, it is sometimes usefu 阅读全文

摘要： 题目描述 Given a list of non negative integers, arrange them such that they form the largest number. 题目大意 给定一个非零整数数组，将数组中的数字按照一定的顺序排列组成一个最大的数。 示例 E1 E2 解题 阅读全文

摘要： 题目描述 Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Calling next() will return 阅读全文

摘要： 题目描述 Given an integer n, return the number of trailing zeroes in n!. 题目大意 给定一个正整数n，计算n！的后缀有几个零。 示例 E1 E2 解题思路 因为在n！中每出现一个5就会产生一个零（5 * 2 = 10、15 * 12 = 阅读全文

摘要： 题目描述 Given two integers representing the numerator and denominator of a fraction, return the fraction in string format. If the fractional part is repe 阅读全文

摘要： 题目描述 Compare two version numbers version1and version2.If version1 > version2 return 1; if version1 < version2 return -1;otherwise return 0. You may as 阅读全文