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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5.      int n,k,z,i,j ;
  6.      cin>>n>>k;
  7.      vector<int> A(n);
  8.      for(i=0;i<n;++i){
  9.          cin>>A[i];
  10.      }
  11.      int x = pow(2,n)-1;
  12.      for(i=0;i<=x;++i) {
  13.      	if(__builtin_popcount(i)!=k) continue;
  14.      	for(j=0;j<n;++j){
  15.      		z = 1<<j;
  16.      		if(z & i){
  17.      			cout<<A[j]<<" ";
  18.      		}
  19.      	}
  20.      	cout<<endl;
  21.      }
  22. }
Success #stdin #stdout 0s 2864KB
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https://ideone.com/Uc8i0a
language:
C++ 4.3.2 (gcc-4.3.2)
created:
10 years ago
visibility:
public

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