Cod sursa(job #1256029)

Utilizator alexandru.ghergutAlexandru-Gabriel Ghergut alexandru.ghergut Data 5 noiembrie 2014 18:33:07
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.5 kb
#include <fstream>
using namespace std;

int binarySearch(int left, int right, int v[], int type, int x);

int main()
{
    int N, M, i;
    ifstream f("cautbin.in");
    f >> N;
    int v[N], type, x;
    for (i = 0; i < N; i++)
        f >> v[i];
    f >> M;
    ofstream g("cautbin.out");
    for (i = 0; i < M; i++)
    {
        f >> type;
        f >> x;
        g << binarySearch(0, N - 1, v, type, x) << "\n";
    }
    f.close();
    g.close();
    return 0;
}

int binarySearch(int left, int right, int v[], int type, int x)
{
    int middle, i, pos = -2;
    bool found = false;
    int n = right;
    while (left <= right && !found)
    {
        middle = left + (right - left) / 2;
        if (v[middle] == x)
        {
            found = true;
            if (type == 0 || type == 1)
                for (i = middle; i < n - 1 && v[i + 1] == x; i++);
            else
                for (i = middle; i > 0 && v[i - 1] == x; i--);
            pos = i;
        }
        else if (v[middle] < x)
        {
            left = middle + 1;
            if (left > right)
            {
                if (type == 1)
                    pos = right;
                else if (type == 2)
                    pos = left;
            }
        }
        else
        {
            right = middle - 1;
            if (left > right)
            {
                if (type == 1)
                    pos = right;
                else if (type == 2)
                    pos = left;
            }
        }
    }

    return ++pos;
}