```
#include<bits/stdc++.h>
using namespace std;
int n,a[101],ans;
bool p[10001];
int main ()
{
cin>>n;
for (int i=1;i<=n;i++) cin>>a[i];
sort (a+1,a+n+1);
for (int i=n;i>2;i--)
for (int j=i-1;j>1;j--)
for (int k=j-1;k>0;k--)
if (!p[i]&&a[j]+a[k]==a[i])
{
ans++;
p[i]=true;
break;
}
cout<<ans<<endl;
return 0;
}
```
可能会重复
by hhhcj @ 2023-10-15 20:37:07