Cod sursa(job #1291414)
Utilizator | Rotaru Gheorghe-Iulian iulianrotaru | Data | 12 decembrie 2014 19:27:11 |
---|---|---|---|
Problema | Numarare triunghiuri | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.46 kb |
#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("nrtri.in"); ofstream g("nrtri.out");
int n,i,j,k,nr,x,poz,v[2004];
int main()
{ f>>n;
for(i=1;i<=n;++i) f>>v[i];
sort(v+1,v+n+1);
for(i=1;i<=n-2;++i)
{ poz=i+1;
for(j=i+1;j<=n-1;++j)
{ x=v[i]+v[j];
for(k=poz;k<=n;++k) if(v[k]<=x) poz=k; else k=n;
if(poz>j) nr+=(poz-j);
}
}
g<<nr<<'\n'; return 0;
}