Cod sursa(job #3155579)
Utilizator | Marius Mihalache Bogdan345 | Data | 8 octombrie 2023 18:39:52 |
---|---|---|---|
Problema | Numarare triunghiuri | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.55 kb |
#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
ifstream cin("nrtri.in");
ofstream cout("nrtri.out");
vector<int>v;
int n;
void read(){
cin>>n;
v.clear();
v.resize(n+1);
for(int i=1;i<=n;i++){
cin>>v[i];
}
}
void solve(){
read();
sort(v.begin()+1,v.end());
int rasp=0;
for(int i=1;i<=n;i++){
int k=i+1;
for(int j=i+1;j<=n;j++){
while(k<=n && v[i]+v[j]>=v[k]){
k++;
}
rasp+=(k-j-1);
}
}
cout<<rasp;
}
int main()
{
int t=1;
while(t--){
solve();
}
}