poj 1564

• Source Code

  /*
   * Author:lonelycatcher
   * problem:ZOJ 1711
   * Type: DFS
   */
  #include<iostream>
  #include<stdio.h>
  #include<queue>
  #include<string>
  #include<string.h>
  using namespace std;
  int t,n;
  struct node
  {
  	int data;
  	int preindex;
  };
  node lis[15];
  int OK,count;
  void printpath(int index)
  {
  	if(lis[index].preindex==-1)
  	{
  	   printf("%d",lis[index].data);
  	}
  	else
  	{
          printpath(lis[index].preindex);
          printf("+%d",lis[index].data);
  	}
  }
  void DFS(int index,int presum)
  {
     if(presum>t)return ;
     if(presum==t)
     {
  	   OK=1;
         printpath(index);
         cout<<endl;
         return ;
     }
     for(int i=index+1;i<=n;i++)
     {
  	   lis[i].preindex=index;
  	   DFS(i,presum+lis[i].data);
  	   lis[i].preindex=-1;
  	   while(i<=n && lis[i].data==lis[i+1].data)i++;
     }
  }
  int main()
  {
  	setbuf(stdout,NULL);
  	int i;
  	while(scanf("%d %d",&t,&n)!=EOF)
  	{
  		if(t==0&&n==0)break;
  		OK=0;
  		for(i=1;i<=n;i++)
  		{
  			scanf("%d",&lis[i].data);
  		    lis[i].preindex=-1;
  		}
  		printf("Sums of %d:\n",t);
  		for(i=1;i<=n;i++)
  		{
  			lis[i].preindex=-1;
  			DFS(i,lis[i].data);
  			while(i<=n && lis[i].data==lis[i+1].data)i++;
  		}
  		if(!OK)
  		{
  			printf("NONE\n");
  			continue;
  		}
  	}
  	return 0;
  }