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- #include <iostream>
- #include <cmath>
- using namespace std;
- int main() {
- int n;
- cin >> n;
- for(int mask = 0; mask < (1 << n); mask++) {
- for(int i = 0; i < n; i++) {
- if(mask & (1 << i)) {
- cout << i << " ";
- }
- }
- cout << endl;
- }
- return 0;
- }
- // 1010001110101
- // 1010001110101
- // {1, 2, 3}
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