Cod sursa(job #754324)
Utilizator | Data | 1 iunie 2012 17:19:53 | |
---|---|---|---|
Problema | Numarare triunghiuri | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.49 kb |
#include<cstdio>
#include<algorithm>
using namespace std;
int main()
{
int i,j,*q,v[810],n,a,b,s=0;
freopen("nrtri.in","r",stdin);
freopen("nrtri.out","w",stdout);
scanf("%d",&n);
for(i=1;i<=n;i++) scanf("%d",&v[i]);
sort(v+1,v+n+1);
for(i=1;i<=n-2;i++)
{
for(j=i+1;j<=n-1;j++)
{
a=v[i]; b=v[j];
q=upper_bound(v+1,v+n+1,a+b);
s+=q-v-j-1;
}
}
printf("%d",s);
return 0;
}