江湖神棍的工作岁月

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. 一般步骤： 1、计算不用进 Read More

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 ston Read More

Write a function that takes a string as input and returns the string reversed. Example:Given s = "hello", return "olleh". Subscribe to see which compa Read More

1、 >>> print('C:\some\name') # here \n means newline! C:\some ame >>> print(r'C:\some\name') # note the r before the quote C:\some\name第一个语句中 print中没有 Read More

Given an array of integers, every element appearstwiceexcept for one. Find that single one.Note:Your algorithm should have a linear runtime complexity... Read More

Given a binary tree, return thebottom-up level ordertraversal of its nodes' values. (ie, from left to right, level by level from leaf to root).For exa... Read More

Binary Tree Level Order TraversalMy SubmissionsQuestionSolutionTotal Accepted:67360Total Submissions:228717Difficulty:EasyGiven a binary tree, return ... Read More

Given a set of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the candidate numbers sums toT.Thesamerepeated num... Read More

class Solution {public: vector> fourSum(vector& nums, int target) { sort(nums.begin(),nums.end()); int n = nums.size(); vector... Read More

Follow up for "Unique Paths":Now consider if some obstacles are added to the grids. How many unique paths would there be?An obstacle and empty space i... Read More