#include<stdio.h> #include<stdlib.h> #include<math.h> #include<time.h> int main() { int a[] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}; int n=16; int i,j,T=1000,tmp; srand(unsigned(time(NULL))); while(T--) { i=rand()%n; j=rand()%n;
function getRandomInt(min, max) { return Math.floor(Math.random() * (max - min + 1) + min) } function shuffle(arr) { let _arr = arr.slice() // 创建一个源数组的副本 for (let i = 0; i < _arr.length; i++) { let j = getRandomInt(0, i) let t = _arr[i] _arr[i] = _ar
使用Collections类中shuffle随机打乱List内部元素顺序 原文地址:http://blog.csdn.net/warren2013/article/details/17414771 //适合洗牌程序 public class TestMain { public static void main(String[] args) { List<String> list = new ArrayList<String>(); list.add("1");
在JAVA中如果想打乱LIST的顺序可以调用Collections.shuffle()或者Collections.shuffle(List<?> list, Random rnd)方法. Random rand = new Random(); Integer[] ia = {1,2,3,4,5,6,7,8,9,10}; List<Integer> list1 = new ArrayList<Integer>(Arrays.asList(ia)); System.out.
1. You are using safe update mode and you tried to update a table without a WHERE clause that uses a KEY column."原因是在safe mode下,where条件必须使用key column,取消限制 SET SQL_SAFE_UPDATES=0; 2. MYSQL中group_concat有长度限制,默认1024,详细参考 http://blog.csdn.net/catoop/arti