Cod sursa(job #574761)
Utilizator | kill03 informatician29 | Data | 7 aprilie 2011 15:17:01 |
---|---|---|---|
Problema | Numarare triunghiuri | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.42 kb |
#include<fstream>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
void citire(char nume_fis[20],int v[801],int& n)
{int i;
f>>n;
for(i=1;i<=n;i++) f>>v[i];
}
int main()
{
int n,v[801],nr=0,i,j,k;
citire("nrtri.in",v,n);
sort(v+1,v+n+1);
for(i=1;i<n-1;i++)
for(j=i+1;j<n;j++)
{k=j+1;
while(k<=n&&v[j]+v[i]>=v[k])
k++;
nr+=k-j-1;
i++;}
g<<nr;
return 0;
}