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你的程序里好几处错误。

Posted by ACM06021fly at 2006-09-08 09:36:30 on Problem 2549
In Reply To:我穷举d-c,然后用O(n)的算法可以算出d-c==a+b?但程序出现一个好搞笑的问题,哪位大哥帮我看看 Posted by:zerocool_08 at 2005-10-12 22:04:31
> #include "stdio.h"
> #include "stdlib.h"
> int cmp(const void *p1,const void *p2)
> {
>     return *(int *)p1-*(int *)p2;
> }    
> int main(void)
> {
>     int   n,i,j,k,m,flag,a[1010],s,t=0,b[10]={0};
>     while(scanf("%d",&n)==1&&n)
>     {
>         for(i=0;i<n;i++)
>            scanf("%d",&a[i]);
>     
>       flag=0;
>       qsort(a,n,sizeof(int),cmp);
>       for(i=n-1;!flag&&i>=0;i--)
>          for(j=n-1;!flag&&j!=i&&j>=0;j--)   //从n-1递减就WA,把j从0递增的话就AC了,T T
>            for(m=0,k=n-1;m<k;){
>                if(m==i||m==j)
>                    m++;
>                if(k==i||k==j)
>                    k--;
>                if(m<k)
>                {
>                    if(a[i]-a[j]==a[m]+a[k])
>                    {  flag=1,s=a[i];b[t++]=s;break;}
>                    else
>                    if(a[i]-a[j]<a[m]+a[k])
>                         k--;
>                    else
>                       m++;
>                }    
>            }  
>        if(flag)
>          printf("%d\n",s);
>        else
>          printf("no solution\n");
>     }
>     printf("\n\n%d   %d   %d  %d  %d\n",b[0],b[1],b[2],b[3],b[4]);
>     scanf("%d",&n);
> }      

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