next_permutation(begin,end)

next_permutation(begin,end)

When there are arranged the one kind (in lexicographic order) discharge method returns true, otherwisefalse

Return truesimultaneously from the array into the next one kind lexicographically discharge method.

Test code:

// Created by CAD on 2020/1/15.
#include <bits/stdc++.h>
#include <ext/rope>
using namespace std;
int main()
{
    int a[4]={1,2,3};
    do{
        for(int i=0;i<=2;++i)
            cout<<a[i]<<" ";cout<<endl;
    }while(next_permutation(a,a+3));
    return 0;
}

Output:

1 2 3
1 3 2
2 1 3
2 3 1
3 1 2
3 2 1