Cod sursa(job #1141714)
Utilizator | Bucevschi Alexandru alex_bucevschi | Data | 13 martie 2014 08:07:54 |
---|---|---|---|
Problema | Numarare triunghiuri | Scor | 45 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.43 kb |
#include <cstdio>
#include <algorithm>
using namespace std;
int n,i,a[805],j,sol;
int main()
{
freopen("nrtri.in","r",stdin);
freopen("nrtri.out","w",stdout);
scanf("%d",&n);
for(i=1;i<=n;i++)
scanf("%d",&a[i]);
sort(a+1,a+n+1);
for(i=1;i<n;i++)
for(j=i+1;j<=n;j++)
sol+=upper_bound(a+1,a+n+1,a[i]+a[j])-upper_bound(a+1,a+n+1,a[j]);
printf("%d",sol);
return 0;
}