Cod sursa(job #1626250)

Utilizator stefanst77Luca Stefan Ioan stefanst77 Data 2 martie 2016 23:54:45
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.19 kb
#include <fstream>

using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");

int a[100005],n,m;

int CautBin1(int b)
{
    int st, dr, m, poz;
    st=1; dr=n; 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 CautBin2(int b)
{
    int st, dr, m, poz;
    st=1; dr=n; 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 CautBin3(int b)
{
    int st, dr, m, poz;
    st=1; dr=n; 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<<CautBin1(x)<<"\n";
        if(y==1)fout<<CautBin2(x)<<"\n";
        if(y==2)fout<<CautBin3(x)<<"\n";
    }
    fin.close();
    fout.close();
    return 0;
}