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： Given a non-empty integer array of size n, find the minimum number of moves required to make all array elements equal, where a move is incrementin 阅读全文

摘要：题目： Assume you are an awesome parent and want to give your children some cookies. But, you should give each child at most one cookie. Each child i has 阅读全文

摘要：题目： Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will return true if the 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： Given an m * n matrix M initialized with all 0's and several update operations. Operations are represented by a 2D array, and each operation is re 阅读全文

摘要：题目： or a web developer, it is very important to know how to design a web page's size. So, given a specific rectangular web page’s area, your job by no 阅读全文

摘要：题目： Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements. For example, 阅读全文

摘要：题目： Given two strings s and t which consist of only lowercase letters. String t is generated by random shuffling string s and then add one more letter 阅读全文

摘要：题目： Given a binary search tree and the lowest and highest boundaries as L and R, trim the tree so that all its elements lies in [L, R] (R >= L). You m 阅读全文

摘要：题目： Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example:Given a = 1 and b = 2, return 3. 代码： 使用移位来 阅读全文

摘要：题目： Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. For example: Given num = 38, the process is l 阅读全文

摘要：题目： Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements of [1, 阅读全文

摘要：题目： Invert a binary tree. 4 / \ 2 7 / \ / \ 1 3 6 9 to 4 / \ 7 2 / \ / \ 9 6 3 1 代码： Invert a binary tree. 自己的（递归实现）： 别人的： 自己的（使用队列，非递归实现）: 非递归和递归的在Le 阅读全文

摘要：题目： Given a word, you need to judge whether the usage of capitals in it is right or not. We define the usage of capitals in a word to be right when on 阅读全文

摘要：题目： Given a binary array, find the maximum number of consecutive 1s in this array. Example 1: Note: The input array will only contain 0 and 1. The len 阅读全文

摘要：题目： Given an array of integers, every element appears twice except for one. Find that single one. Note:Your algorithm should have a linear runtime com 阅读全文

摘要：题目： You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time one of you take turns to remove 1 to 3 阅读全文

摘要：题目： anysubsequence of the other strings. A subsequence is a sequence that can be derived from one sequence by deleting some characters without changin 阅读全文

摘要：题目： Given a non-empty binary tree, return the average value of the nodes on each level in the form of an array. Example 1: Input: 3 / \ 9 20 / \ 15 7 阅读全文