二进制求子集

当个模板用吧

#include <iostream>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <string>
using namespace std;

int main()
{
    int n, s[50] = {0};
    scanf("%d", &n);
    for(int i = 0; i < n; ++i) scanf("%d", &s[i]);
    for(int i = 0; i < (1 << n); ++i) {
        for(int j = 0; j < n; ++j)
            if(i & (1 << j)) printf("%d ", s[j]);
        printf("\n");
    }
    return 0;
}