Cod sursa(job #2769748)
Utilizator | Mendea Ianis Teodor Mendea_Ianis | Data | 17 august 2021 16:21:29 |
---|---|---|---|
Problema | Numarare triunghiuri | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.94 kb |
#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int main()
{
int n,V[805],st,dr,sol,S,mid,nrtri = 0;
fin>>n;
for(int i = 1;i<=n;i++)
{
fin>>V[i];
}
sort(V+1,V+n+1);
for(int i = 1;i<=n;i++)
{
for(int j = i+1;j<=n;j++)
{
sol = 0;
S = V[i] + V[j];
st = j+1;
dr = n;
while(st<=dr)
{
mid = (st+dr)/2;
if(V[mid]<=S)
{
sol = mid-j;
st = mid+1;
}
else
{
if(V[mid]>S)
{
dr = mid-1;
}
}
}
nrtri = nrtri + sol;
}
}
fout<<nrtri;
}