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Dec 19th, 2018
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  1. #include <iostream>
  2. #include <cmath>
  3. #include <algorithm>
  4. #include <vector>
  5.  
  6. using namespace std;
  7.  
  8. int n, k;
  9. vector <int> c;
  10.  
  11. void rec(int ind) {
  12. if (c.size() == k) {
  13. for (auto i : c) cout << i << " ";
  14. cout << "\n";
  15. return;
  16. }
  17. for (int i = ind; i <= n; ++i) {
  18. c.push_back(i);
  19. rec(i + 1);
  20. c.pop_back();
  21. }
  22. }
  23.  
  24. int main() {
  25. cin >> n >> k;
  26. rec(1);
  27. return 0;
  28. }
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