Cod sursa(job #2258691)

Utilizator dasdasDas das dasdas Data 11 octombrie 2018 20:28:14
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.37 kb
#include <fstream>

using namespace std;

int n,m,a[100001];

int cautbin0(int x)
{
    int st=1,dr=n,mij,poz=-1;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(a[mij]==x)
        {
              poz=mij;
              st=mij+1;
        }
        if(a[mij]<x)
            st=mij+1;
        if(a[mij]>x)
            dr=mij-1;

    }
    return poz;


}

int cautbin1(int x)
{
    int st=1,dr=n,mij,poz;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(a[mij]<=x)
        {
              poz=mij;
              st=mij+1;
        }
        else
            dr=mij-1;


    }
    return poz;


}

int cautbin2(int x)
{
    int st=1,dr=n,mij,poz;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(a[mij]>=x)
        {
              poz=mij;
              dr=mij-1;
        }
        else
           st=mij+1;


    }
    return poz;


}




int main()
{
    int tip,x;
    ifstream fin("cautbin.in");
    ofstream fout("cautbin.out");
    fin>>n;
    for(int i=1;i<=n;i++)
        fin>>a[i];
    fin>>m;
    for(int i=1;i<=m;i++)
    {
        fin>>tip>>x;
        if(tip==0)
            fout<<cautbin0(x)<<"\n";
        if(tip==1)
            fout<<cautbin1(x)<<"\n";
        if(tip==2)
            fout<<cautbin2(x)<<"\n";
    }
    fin.close();
    fout.close();
    return 0;
}