Cod sursa(job #2345641)

Utilizator chriss_b_001Cristian Benghe chriss_b_001 Data 16 februarie 2019 15:51:37
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.41 kb
#include <iostream>
#include <fstream>

using namespace std;

ifstream f("cautbin.in");
ofstream g("cautbin.out");

int v[100001], N;

int cautbin0(int x)
{
    int p = 1, u = N, poz = -1;
    while(p <= u)
    {
        int m = (p + u) / 2;
        if(v[m] == x)
            poz = m;
        if(x >= v[m])
            p = m + 1;
        else
            u = m - 1;
    }
    return poz;
}

int cautbin1(int x)
{
    int p = 1, u = N, poz = -1;
    while(p <= u)
    {
        int m = (p + u) / 2;
        if(v[m] <= x)
        {
            poz = m;
            p = m + 1;
        }
        else
            u = m - 1;
    }
    return poz;
}

int cautbin2(int x)
{
    int p = 1, u = N, poz = -1;
    while(p <= u)
    {
        int m = (p + u) / 2;
        if(v[m] >= x)
        {
            poz = m;
            u = m - 1;
        }
        else
            p = m + 1;
    }
    return poz;
}

int main()
{
    int M, t, x;
    f >> N;
    for(int i = 1; i <= N; i++)
        f >> v[i];
    f>>M;
    while(M--)
    {
        f >> t >> x;
        switch(t)
        {
        case 0:
            g << cautbin0(x) << '\n';
            break;
        case 1:
            g << cautbin1(x) << '\n';
            break;
        case 2:
            g << cautbin2(x) << '\n';
            //break;
        }
    }
    f.close();
    g.close();
    return 0;
}