洗牌算法---random_shuffle

可以将元素洗牌，变得无序
注意要手动添加随机数种子，否则是伪随机

#include<iostream>
using namespace std;
#include<vector>
#include<algorithm>
#include<ctime>
//random_shuffle
void p(int val)
{
	cout << val << " ";
}
void test01()
{
	vector<int> v = { 1,2,3,4,5,6,7,8,9 };
	cout << "未洗牌前：";
	for_each(v.begin(), v.end(), p);
	cout << "\n洗牌后：";
	random_shuffle(v.begin(), v.end());
	for_each(v.begin(), v.end(), p);
}
int main()
{

	srand((size_t)time(NULL));
	test01();
	cout << endl;
	system("pause");
	return 0;
}