Cod sursa(job #3178378)
Utilizator | Marfon Gabriel GabrielMarfon | Data | 1 decembrie 2023 17:20:29 |
---|---|---|---|
Problema | Numarare triunghiuri | Scor | 0 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.74 kb |
#include <fstream>
#include <algorithm>
using namespace std;
int v[801];
ifstream cin("nrtri.in");
ofstream cout("nrtri.out");
int main()
{
int n;
cin>>n;
for(int i=0;i<n;i++)
{
cin>>v[i];
}
sort(v,v+n);
int k=0;
for(int i=0;i<n-2;i++)
{
for(int j=i+1;j<n-1;j++)
{
int a=v[i];
int b=v[j];
int st=j+1;
int dr=n;
while(dr-st>1)
{
int mij=(st+dr)/2;
if(v[mij]<a+b)
st=mij;
else
dr=mij;
}
if(v[st]<=a+b)
k=k+st-j;
; }
}
cout<<k;
return 0;
}