Cod sursa(job #1623323)

Utilizator tanasaradutanasaradu tanasaradu Data 1 martie 2016 18:47:13
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.15 kb
#include <fstream>
using namespace std;
int a[100005],n,m;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int CautareBinara1(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;
    }
    return poz;
}
int CautareBinara2(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 CautareBinara3(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()
{
    int i,y,x;
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>a[i];
    fin>>m;
    for(i=1;i<=m;i++)
    {
        fin>>y>>x;
        if(y==0)fout<<CautareBinara1(x)<<"\n";
        if(y==1)fout<<CautareBinara2(x)<<"\n";
        if(y==2)fout<<CautareBinara3(x)<<"\n";
    }
    return 0;
}