carry用于纪录超过该位数字超过2的，向前进1 @param a @param b @return

Total Accepted: 153092 Total Submissions: 394417 Difficulty: Easy Contributors: Admin You are climbing a stair case. It takes n st

Given an array and a value, remove all instances of that value in place and return the new length. Do not allocate extra space for another array

The count-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221, ... 1 is read off as "one 1" or 11.

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the

Write a function to find the longest common prefix string amongst an array of strings. 写一个函数来查找字符串数组中最长的公共前缀字符串。 @param args

Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space fo

mplement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 返回needle在haystack中第一次出现的下

Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in or

Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note: You may assume that nums1 has enough spa

罗马数字共有7个，即Ⅰ（1）、Ⅴ（5）、Ⅹ（10）、Ⅼ（50）、Ⅽ（100）、Ⅾ（500）和Ⅿ（1000）。按照下述的规则可以表示任意正整数。需要注意的是罗马数字中没有“0”，与进位制无关。一般认为罗马数字只用来记数，而不作演算。 重复数次：一个罗马数字重复几次，就表示这个数的几倍。 右加左减： 在

Given two binary strings, return their sum (also a binary string). For example, a = "11" b = "1" Return "100". @param args 即二进制的

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