Cod sursa(job #1646651)

Utilizator DaniellDa Vinci Daniell Data 10 martie 2016 17:04:06
Problema Numarare triunghiuri Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.35 kb
Raporteaza aceasta sursa 
#include <fstream>
#include <algorithm>

using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int n,v[801],nr,i,j;
int main()
{fin>>n;
nr=0;
for(i=1;i<=n;i++)fin>>v[i];
sort(v+1,v+n+1);
for(i=1;i<=n-2;++i)
for(j=i+1;j<=n-1;++j)
{
int k=j+1;
while(v[i]+v[j]>=v[k] && k<=n)
++k;
nr+=k-j-1;
}
fout<<nr;
    return 0;
}