shuffle

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#include <iostream>
#include <vector>
#include <algorithm>
#include <time.h>
using namespace std;


void main()
{
int i;
vector<int> vi(20);
vector<int>::iterator it;

for (i=0;i<20;i++) vi[i]=i;
srand(time(NULL));
random_shuffle(vi.begin(),vi.end());
for (it=vi.begin();it!=vi.end();it++) {
cout << *it << ' ';
}
cout << endl;
}