Cod sursa(job #1415623)

Utilizator alex1096Postolache Alex alex1096 Data 5 aprilie 2015 16:05:48
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.55 kb
#include <iostream>
#include <fstream>
using namespace std;
int v[100001],op,y,n,m;
ofstream fout("cautbin.out");
int cautareBinara0(int x)
{
    int st=1,dr=n,m;
    int poz=-1;
    while(st<=dr)
    {
        m=(dr-st)/2+st;
        if(v[m]==x)
        {
            poz=m;
            st=m+1;
        }
        else if(v[m]<x)
        {
            st=m+1;
        }
        else if(v[m]>x)
        {
            dr=m-1;
        }
    }
    return poz;
}
int cautareBinara1(int x)
{
    int st=1,dr=n,m;
    int poz=-1;

    while(st<=dr)
    {
        m=(dr-st)/2+st;
        if(v[m]<=x)
        {
            poz=m;
            st=m+1;
        }
        else
        {
            dr=m-1;
        }
    }
    return poz;
}
int cautareBinara2(int x)
{
    int st=1,dr=n,m;
    int poz=-1;

    while(st<=dr)
    {
        m=(dr-st)/2+st;
        if(v[m]>=x)
        {
            poz=m;
            dr=m-1;
        }
        else
        {
            st=m+1;
        }
    }
    return poz;
}
int main()
{
    ifstream fin("cautbin.in");
    fin>>n;
    for(int i=1;i<=n;++i)
        fin>>v[i];
    fin>>m;
    for(int i=1;i<=m;++i)
    {
        fin>>op>>y;
        if(op==0)
        {
            fout<<cautareBinara0(y)<<"\n";
            continue;
        }
        if(op==1)
        {
            fout<<cautareBinara1(y)<<"\n";
            continue;
        }
        if(op==2)
        {
            fout<<cautareBinara2(y)<<"\n";
            continue;
        }
    }
    return 0;
}