Cod sursa(job #2616798)
Utilizator | Coaje Petrut florian_petrut | Data | 19 mai 2020 23:38:31 |
---|---|---|---|
Problema | Numarare triunghiuri | Scor | 5 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.55 kb |
#include <bits/stdc++.h>
#include <fstream>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int v[800];
int main()
{
int i,j,k,nr=0,n;
f>>n;
for(i=0;i<n;i++)
f>>v[i];
sort(v,v+n);
for(i=0;i<n-2;i++)
{
k=i+2;
for(j=i+1;j<n-1;j++)
{
while(v[i]+v[j]>=v[k]&&k<=n) // se opreste pe pozitia k unde lunigimile nu mai corespund laturilor unui tr
k++;
if(k>j)
nr+=k-j-1;
}
}
g<<nr;
return 0;
}