Cod sursa(job #2266274)

Utilizator vlad_zincaZinca Vlad vlad_zinca Data 22 octombrie 2018 15:38:28
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.25 kb
#include <iostream>
#include <fstream>

using namespace std;

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

int n, i, v[100005], m, nr, x;

int x0 (int n, int v[100005], int x)
{
    int st=1, dr=n, mij, poz=0;
    while (st<=dr)
    {
        mij=(st+dr)/2;
        if (v[mij]<=x)
        {
            poz=mij;
            st=mij+1;
        }
        else dr=mij-1;
    }
    if (v[poz]!=x) return -1;
    return poz;
}

int x1 (int n, int v[100005], int x)
{
    int st=1, dr=n, mij, poz=0;
    while (st<=dr)
    {
        mij=(st+dr)/2;
        if (v[mij]<=x)
        {
            poz=mij;
            st=mij+1;
        }
        else dr=mij-1;
    }
    return poz;
}

int x2 (int n, int v[100005], int x)
{
    int st=1, dr=n, mij, poz=0;
    while (st<=dr)
    {
        mij=(st+dr)/2;
        if (v[mij]>=x)
        {
            poz=mij;
            dr=mij-1;
        }
        else st=mij+1;
    }
    return poz;
}

int main()
{
    f>>n;
    for (i=1; i<=n; i++) f>>v[i];
    f>>m;
    while (m!=0)
    {
        f>>nr>>x;
        if (nr==0) g<<x0 (n, v, x)<<'\n';
        if (nr==1) g<<x1 (n, v, x)<<'\n';
        if (nr==2) g<<x2 (n, v, x)<<'\n';
        m--;
    }
    return 0;
}