[Promise.race] 返回最先完成的promise var p1 = new Promise(function(resolve, reject) { setTimeout(resolve, 500, "one"); }); var p2 = new Promise(function(resolve, reject) { setTimeout(resolve, 100, "two"); }); Promise.race([p1, p2]).then(funct…

golang中的race检测 由于golang中的go是非常方便的,加上函数又非常容易隐藏go. 所以很多时候,当我们写出一个程序的时候,我们并不知道这个程序在并发情况下会不会出现什么问题. 所以在本质上说,goroutine的使用增加了函数的危险系数论go语言中goroutine的使用.比如一个全局变量,如果没有加上锁,我们写一个比较庞大的项目下来,就根本不知道这个变量是不是会引起多个goroutine竞争. 官网的文章Introducing the Go Race Detector给出的例子…

2599: [IOI2011]Race Time Limit: 70 Sec  Memory Limit: 128 MBSubmit: 2590  Solved: 769[Submit][Status][Discuss] Description 给一棵树,每条边有权.求一条简单路径,权值和等于K,且边的数量最小.N <= 200000, K <= 1000000 Input 第一行 两个整数 n, k第二..n行 每行三个整数 表示一条无向边的两端和权值 (注意点的编号从0开始) Output…

Bob’s Race Time Limit: 5000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Problem Description Bob wants to hold a race to encourage people to do sports. He has got trouble in choosing the route. There are N houses and N - 1 roads…

题目链接: http://codeforces.com/problemset/problem/214/E Relay Race time limit per test4 secondsmemory limit per test256 megabytes 问题描述 Furik and Rubik take part in a relay race. The race will be set up on a large square with the side of n meters. The gi…

Race Condition(也叫做资源竞争),是多线程编程中比较头疼的问题.特别是Java多线程模型当中,经常会因为多个线程同时访问相同的共享数据,而造成数据的不一致性.为了解决这个问题,通常来说需要加上同步标志“synchronized”,来保证数据的串行访问.但是“synchronized”是个性能杀手,过多的使用会导致性能下降,特别是扩展性下降,使得你的系统不能使用多个CPU资源.  这是我们在性能测试中经常遇见的问题. 可是上个星期我却遇见了相反的情况:因为缺少同步标志也同样会使性能受…

C. The Big Race Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/592/problem/C Description Vector Willman and Array Bolt are the two most famous athletes of Byteforces. They are going to compete in a race with a distance of…

Bob’s Race Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=4123 Description Bob wants to hold a race to encourage people to do sports. He has got trouble in choosing the route. There are N houses and N - 1 roads…

C - Race to 1 Again Time Limit:2000MS     Memory Limit:32768KB     64bit IO Format:%lld & %llu Description Rimi learned a new thing about integers, which is - any positive integer greater than 1 can be divided by its divisors. So, he is now playing w…

Walking Race   Description flymouse's sister wc is very capable at sports and her favorite event is walking race. Chasing after the championship in an important competition, she comes to a training center to attend a training course. The center has N…