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Sep 21st, 2017
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  1. #include<iostream>
  2. #include<vector>
  3.  
  4. using namespace std;
  5.  
  6. void ccout(vector<int> &a, int x) {
  7. for (int i = 0; i < a.size(); ++i) {
  8. if ((x >> i) & 1)
  9. cout << a[i] << " ";
  10. }
  11. }
  12.  
  13. int main() {
  14. int n;
  15. cin >> n; // размер массива
  16. vector<int> a(n);
  17. for (int i = 0; i < n; ++i)
  18. cin >> a[i]; // считываем массив
  19. for (int i = 0; i < 1 << n; ++i) {
  20. ccout(a, i);
  21. cout << endl;
  22. }
  23. }
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