USACO Section 1.4 Mother's Milk - 输出错了好几次..

就是不断搜索倒牛奶的过程..用一个三维数组来判重就可以了....

恶心的输入或者是我不适应~~末尾多了空格报错...每个文件只有一组数据...输出一行后还必须打个\n....呃...

Program:

/*  
ID: zzyzzy12  
LANG: C++  
TASK: milk3 
*/    
#include<iostream>    
#include<stdio.h>    
#include<string.h>    
#include<math.h>    
#include<algorithm>    
#include<queue>
using namespace std;
int ans[201],num,A,B,C;
bool f[21][21][21];
void search(int a,int b,int c)
{ 
     if (f[a][b][c]) return;
     f[a][b][c]=true;
     if (!a) 
     {
          num++;
          ans[num]=c;       
     }  
     if (a+b>B) search(a-B+b,B,c); else search(0,a+b,c);
     if (a+c>C) search(a-C+c,b,C); else search(0,b,a+c);
     if (b+a>A) search(A,b-A+a,c); else search(b+a,0,c);
     if (b+c>C) search(a,b-C+c,C); else search(a,0,c+b);
     if (c+a>A) search(A,b,c-A+a); else search(a+c,b,0);
     if (c+b>B) search(a,B,c-B+b); else search(a,c+b,0);    
}
int main()
{
     freopen("milk3.in","r",stdin);
     freopen("milk3.out","w",stdout);
     memset(f,false,sizeof(f));
     num=0;
     scanf("%d%d%d",&A,&B,&C);
     search(0,0,C);
     sort(ans+1,ans+1+num);
     for (int i=1;i<num;i++) printf("%d ",ans[i]); 
     printf("%d\n",ans[num]);
     return 0;   
}