| ||||||||||
| Online Judge | Problem Set | Authors | Online Contests | User | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Web Board Home Page F.A.Qs Statistical Charts | Current Contest Past Contests Scheduled Contests Award Contest | |||||||||
why wa#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int num[21]={0},count=0;
int cmp ( const void *a , const void *b )
{
return *(int *)a - *(int *)b;
}
void main()
{
int n,m,j,i,t;
long max=0,len;
scanf("%d",&n);
for(t=0;t<n;t++)
{
scanf("%d",&m);
for(j=0;j<m;j++)
{
scanf("%d",&num[j]);
max+=num[j];
}
if(max%4!=0)
{
printf("no\n");
goto a;
}
else len=max/4;
qsort(num,m,sizeof(num[0]),cmp);
i=0;j=m-1;
while(i<=j)
{
if(num[i]==len)
{
i++;count++;
}
else if(num[j]==len)
{
j--;count++;
}
else if((num[i]+num[j])>len) break;
else if((num[i]+num[j])==len)
{
i++;j--;
count++;
}
else i++;
}
if(count==4) printf("yes\n");
else printf("no\n");
a: memset(num,0,m);count=0;max=0;
}
}
Followed by: Post your reply here: |
All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please Contact Administrator