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  1. #include <iostream>
  2. using namespace std;
  3. int N,M;
  4. char s[20]={0};
  5. void permute(int x, int cnt) {
  6.     if (cnt==M) {
  7.         cout << s << "\n";
  8.         return;
  9.     }
  10.     for (int y=x;y<=N;y++) {
  11.         s[2*cnt]=y+'0';
  12.         s[2*cnt+1]=' ';
  13.         permute(y, cnt+1);
  14.     }    
  15. }
  16.  
  17. int main() {
  18.     cin.tie(0)->sync_with_stdio(0);
  19.     cin >> N >> M;
  20.     permute(1, 0);
  21. }
Success #stdin #stdout 0.01s 5280KB
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stdin
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4 2
stdout
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1 1 
1 2 
1 3 
1 4 
2 2 
2 3 
2 4 
3 3 
3 4 
4 4
https://ideone.com/6qqjnd
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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