Cod sursa(job #3140838)
Utilizator | Ruxandra Vasilescu Ruxandra009 | Data | 10 iulie 2023 11:07:30 |
---|---|---|---|
Problema | Numarare triunghiuri | Scor | 0 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.66 kb |
#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
int A[805], n, numi;
int main()
{
f >> n;
for(int i = 1; i <= n; i ++)
f >> A[i];
for(int i = 1; i < n - 1; i ++)
for(int j = i + 1; j < n; j ++)
{
int st = j, dr = n, poz = j;
while(st <= dr)
{
int m = (st + dr) / 2;
if(A[m] <= A[i] + A[j])
st = m + 1, poz = m;
else
dr = m - 1;
}
numi += (poz - j);
}
g << numi;
return 0;
}