Cod sursa(job #2081148)

Utilizator SmitOanea Smit Andrei Smit Data 4 decembrie 2017 08:54:22
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.47 kb
#include <fstream>

using namespace std;

int n,m;
int a[100003];

int CautBin0(int x)
{
    int st,dr,mijl,poz;
    st=1;
    dr=n;
    poz=-1;
    while(st<=dr)
    {
        mijl=(st+dr)/2;
        if(a[mijl]<x)
            st=mijl+1;
        if(a[mijl]>x)
            dr=mijl-1;
        if(a[mijl]==x)
        {
            poz=mijl;
            st=mijl+1;
        }
    }
    return poz;
}

int CautBin1(int x)
{
    int st,dr,mijl,poz;
    st=1;
    dr=n;
    poz=-1;
    while(st<=dr)
    {
        mijl=(st+dr)/2;
        if(a[mijl]<=x)
        {
            poz=mijl;
            st=mijl+1;
        }
        else
            dr=mijl-1;
    }
    if(poz==-1)
        while(1);
    return poz;
}

int CautBin2(int x)
{
    int st,dr,mijl,poz;
    st=1;
    dr=n;
    poz=-1;
    while(st<=dr)
    {
        mijl=(st+dr)/2;
        if(a[mijl]>=x)
        {
            poz=mijl;
            dr=mijl-1;
        }
        else
            st=mijl+1;
    }
    if(poz==-1)
        while(1);
    return poz;
}

int main()
{
    int i,c,x;
    ifstream fin("cautbin.in");
    ofstream fout("cautbin.out");
    fin>>n;
    for(i=1;i<=n;++i)
        fin>>a[i];
    fin>>m;
    for(i=1;i<=m;++i)
    {
        fin>>c>>x;
        if(c==0)    fout<<CautBin0(x)<<"\n";
        if(c==1)    fout<<CautBin1(x)<<"\n";
        if(c==2)    fout<<CautBin2(x)<<"\n";
    }
    fin.close();
    fout.close();
    return 0;
}