Cod sursa(job #1496698)

Utilizator DobosDobos Paul Dobos Data 5 octombrie 2015 13:50:28
Problema Numarare triunghiuri Scor 0
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.81 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin ("nrtri.in");
ofstream fout ("nrtri.out");
int v[805],n;
int binar(int val)
{
    int i, step;
    for (step = 1; step < n; step <<= 1);
    for (i = 0; step; step >>= 1)
        if (i + step < n && v[i + step] <= val)
           i += step;
    return i;
}
int main()
{
    int n,nr =  0,poz,s;
    fin >> n;
    for(int i = 0; i < n ; i++)
        fin >> v[i];
    sort(v,v+n);
    for(int i = 1; i < n - 2; i++){
        s = v[i] + v[i - 1];
        if( s > v[n-1])
            i = n + 1;
        else{
        poz = binar(s);
        while(v[poz - 1 ] > s)
            poz--;
        while(v[poz ] <= s)
            poz++;
        nr += poz - i;
        }
           fout << nr << " ";
    }
     fout << nr;
    return 0;
}