Cod sursa(job #1810571)

Utilizator tanasaradutanasaradu tanasaradu Data 20 noiembrie 2016 11:04:31
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.33 kb
#include <bits/stdc++.h>
#define nmax  100005
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int a[nmax],n,m;
void Citire()
{
    int i;
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>a[i];
}
int CautBin_0(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;
        }
        else if(a[mij]<x)
            st=mij+1;
        else dr=mij-1;
    }
    return poz;
}
int CautBin_1(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;
        }
        else dr=mij-1;
    }
    return poz;
}
int CautBin_2(int x)
{
    int st=1,dr=n,mij,poz=-1;
    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 op,x,i;
    Citire();
    fin>>m;
    for(i=1;i<=m;i++)
    {
        fin>>op>>x;
        if(op==0)
            fout<<CautBin_0(x)<<"\n";
        else if(op==1)
            fout<<CautBin_1(x)<<"\n";
        else fout<<CautBin_2(x)<<"\n";
    }
    fin.close();
    fout.close();
    return 0;
}