729uva海明距离问题

next_permunation用时更短0.000,固定几个字母的组合都可考虑next_permutation

前一篇的递归枚举用时0.100

/*******************************************************/
/* UVa 729 The Hamming Distance Problem                */
/* Author: LanyiKnight [at] knightzone.org             */
/* Version: 2016/07/27                                 */
/*******************************************************/
#include 
#include 
#include 
#include 
using namespace std;

int main(){
  int numberOfDataset;
  while( scanf("%d", &numberOfDataset) != EOF ){
    for( int testNumber = 0 ; testNumber < numberOfDataset ; ++testNumber ){
      if( testNumber > 0 ){
        printf("\n");
      }

      int N, H;
      scanf("%d%d", &N, &H);

      string s;
      for( int i = 0 ; i < N-H ; ++i ){
        s += '0';
      }

      for( int i = 0 ; i < H ; ++i ){
        s += '1';
      }

      do{
        printf("%s\n", s.c_str());
      } while( next_permutation(s.begin(), s.end()) );
    }
  }

  return 0;
}