二进制数递增

C++11 代码

#include <iostream>
using namespace std;
int main(int argc, char **argv)
{
    int maxnum;
    cin >> maxnum;
    for (int i = 0; i != 1 << maxnum; ++i)
    {
        for (int j = 0; j != maxnum; ++j)
            if (i & (1 << j))
                cout << j + 1 << ' ';
        cout << endl;
    }
    return EXIT_SUCCESS;
}