S1xe

#include <algorithm>
#include <iostream>
#include <vector>
#include <chrono>
#include <random>
using namespace std;
int main()
{
    vector<int> v(10000000,0);
	int n{0};
	//依次生成0-9999999
	generate(v.begin(), v.end(), [&] {return n++; });

	//根据mt19937将v乱序
	random_device rd;
	mt19937 g(rd());
	auto start = chrono::system_clock::now();//计时开始
	shuffle(v.begin(), v.end(),g);
	auto end = chrono::system_clock::now();//计时结束

	//输出计时
	auto duration = chrono::duration_cast<chrono::microseconds>(end - start);
	cout << double(duration.count()) * chrono::microseconds::period::num / chrono::microseconds::period::den << endl;

	cout << v[v.size() - 1] << endl;//可有可无
	return 0;
}