[cpp]
#include
#include
#include
using namespace std;
int num[25];
int sum=0,len;
int n;
bool ok;
bool vis[25];
void dfs(int s,int k,int cnt)
{ int i;
if(s==len)
{
cnt++;
if(cnt==4)
{ok=1;return;}
s=0;k=0;
}
if(ok)return;
for(i=k;i
if(vis[i]==false)
{
if(s+num[i]>len)
continue;
vis[i]=true;
dfs(s+num[i],i,cnt);
vis[i]=false;
}
}
}
int main()
{
int t;
scanf("%d",&t);
while(t--)
{
ok=0;
sum=0;
scanf("%d",&n);
int max=-10;
for(int i=0;i
scanf("%d",&num[i]);
if(max
sum+=num[i];
vis[i]=false;
}
if(n<4)
{ printf("no\n");continue;}
if(sum%4||sum/4
printf("no\n");continue;
}else
{
len=sum/4;
dfs(0,0,0);
if(ok)
printf("yes\n");
else
printf("no\n");
}
}
return 0;
}
///*
//10
//6 3 4 4 3 1 1
//20 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
//*/
作者： Java_beginer1