Cod sursa(job #2209703)

Utilizator marcogoldPop Mihali Marco Silviu marcogold Data 4 iunie 2018 12:41:27
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.92 kb
#include <iostream>
#include <fstream>
std::ifstream in("cautbin.in");
std::ofstream out("cautbin.out");
using namespace std;

int n,a,sir[1000000],test,poz;

int cautbin(int x)
{
    int poz=0;
    for(int i=19;i>=0;--i)
    {
        if(poz+(1<<i)<=n && sir[poz+(1<<i)]<=x)
           {
               poz+=(1<<i);
           }
    }
    return poz;
}

int main()
{
    in>>n;
    for(int i=1;i<=n;++i)
    {
        in>>sir[i];
    }
    in>>test;
    for(int i=0;i<test;i++)
    {
        in>>a>>poz;
        int p;
        if(a==0)
        {
            p=cautbin(poz);
            if(sir[p]==poz)
                out<<p<<'\n';
            else out<<-1<<'\n';
        }
        else if(a==1)
        {
            p=cautbin(poz);
            out<<p<<'\n';
        }
        else if(a==2)
        {
            p=cautbin(poz-1)+1;
            out<<p<<'\n';
        }
    }
    return 0;
}