Cod sursa(job #2901351)
Utilizator | Burlacu Andrei bagae123 | Data | 13 mai 2022 16:59:43 |
---|---|---|---|
Problema | Numarare triunghiuri | Scor | 0 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.55 kb |
#include <fstream >
#include<algorithm>
using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int v[1001];
int main()
{
int n,i,nr=0,dr,st,mij,j;
fin>>n;
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++)
{
st=j+1;dr=n;
while(st<=dr)
{
mij=(st+dr)/2;
if(v[mij]<=v[i]+v[j]){st++;nr++;}
else dr--;
}
}
}
}fout<<nr;
return 0;
}