摘要：
题目： 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 adj 阅读全文
摘要：
题目： 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. For 阅读全文
摘要：
题目： You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stoppin 阅读全文
摘要：
题目： Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 32- 阅读全文
摘要：
题目： Reverse bits of a given 32 bits unsigned integer. For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), r 阅读全文
摘要：
题目： Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4]. 阅读全文
摘要：
题目：链接：题解：测试：Reference: 阅读全文
摘要：
题目： 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 useful 阅读全文
摘要：
题目： Given an input string, reverse the string word by word. A word is defined as a sequence of non-space characters. The input string does not contain 阅读全文
摘要：
题目： Given a list of non negative integers, arrange them such that they form the largest number. For example, given [3, 30, 34, 5, 9], the largest form 阅读全文
摘要：
题目：The demons had captured the princess (P) and imprisoned her in the bottom-right corner of a dungeon. The dungeon consists of M x N rooms laid out i... 阅读全文
摘要：
题目： 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 t 阅读全文
摘要：
题目： Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. 链接： http://leetcode. 阅读全文
摘要：
题目： Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, return its corresponding column number. For example 阅读全文
摘要：
题目： Design and implement a TwoSum class. It should support the following operations: add and find. add - Add the number to an internal data structure. 阅读全文
摘要：
题目： Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times. You may assume that 阅读全文
摘要：
题目： Given a positive integer, return its corresponding column title as appear in an Excel sheet. For example: 链接： http://leetcode.com/problems/excel-s 阅读全文
摘要：
题目： Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The func 阅读全文
摘要：
题目： Given two integers representing the numerator and denominator of a fraction, return the fraction in string format. If the fractional part is repea 阅读全文
摘要：
题目： Compare two version numbers version1 and version2.If version1 > version2 return 1, if version1 < version2 return -1, otherwise return 0. You may a 阅读全文