Cod sursa(job #1630957)

Utilizator pimao2004Lupu Stefan Dragos pimao2004 Data 5 martie 2016 12:15:31
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.26 kb
#include <fstream>

using namespace std;
int a[100001],n,m;
ifstream in ("cautbin.in");
ofstream out ("cautbin.out");
int CautBina1(int b)
{
    int st=1,dr=n,m,poz;
    poz=-1;
    while(st<=dr)
    {
        m=(st+dr)/2 ;
        if(a[m]==b)
        poz=m;
        if(a[m]<b)
            st=m+1;
        else dr=m-1;
    }
    while(a[poz]==b)
    poz++;
    if(poz!=-1)
    return poz-1;
    else
    return poz;
}
int CautBina2(int b)
{
    int st=1,dr=n,m,poz;
    poz=0;
    while(st<=dr)
    {
        m=(st+dr)/2 ;
        if(a[m]<=b)
        {
            poz=m;
            st=m+1;
        }
        else dr=m-1;
    }
    return poz;
}
int CautBina3(int b)
{
    int st=1,dr=n,m,poz;
    poz=0;
    while(st<=dr)
    {
        m= (st+dr)/2 ;
        if(a[m]>=b)
        {
            poz=m;
            dr=m-1;
        }
        else st=m+1;
    }
    return poz;
}
int main()
{
    in>>n;
    int i,cer,x;
    for(i=1; i<=n; i++)
        in>>a[i];
    in>>m;
    for(i=1; i<=m; i++)
    {
        in>>cer>>x;
        if(cer==0)
            out<<CautBina1(x)<<'\n';
        if(cer==1)
            out<<CautBina2(x)<<'\n';
        if(cer==2)
            out<<CautBina3(x)<<'\n';
    }
    return 0;
}