Cod sursa(job #2622572)

Utilizator SahisttulArsene Marinel Sahisttul Data 1 iunie 2020 15:13:54
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.36 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");

int N, v[100001];

int caut0(int x)
{
    int p = 1, u = N, poz = -1;
    while(p <= u)
    {
        int m = (p + u) / 2;
        if(x == v[m])
            poz = m;
        if(x >= v[m])
            p = m + 1;
        else
            u = m - 1;
    }
    return poz;
}

int caut1(int x)
{
    int p = 1, u = N, poz = -1;
    while(p <= u)
    {
        int m = (p + u) / 2;
        if(x >= v[m])
        {
            poz = m;
            p = m + 1;
        }
        else
            u = m - 1;
    }
    return poz;
}

int caut2(int x)
{
    int p = 1, u = N, poz = -1;
    while(p <= u)
    {
        int m = (p + u) / 2;
        if(x <= v[m])
        {
            poz = m;
            u = m - 1;
        }
        else
            p = m + 1;
    }
    return poz;
}


int main()
{
    f >> N;
    for(int i = 1; i <= N; i++)
        f >> v[i];

    int M, t, x;
    f >> M;
    for(int i = 1; i <= M; i++)
    {
        f >> t >> x;
        switch(t)
        {
        case 0:
            g << caut0(x) << '\n';
            break;
        case 1:
            g << caut1(x) << '\n';
            break;
        case 2:
            g << caut2(x) << '\n';
        }
    }
    return 0;
}