Cod sursa(job #1846921)

Utilizator ikogamesIon Ceaun ikogames Data 14 ianuarie 2017 10:05:36
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.38 kb
#include <bits/stdc++.h>

using namespace std;

int a[100005];

int CB0(int st , int dr ,int x)
{
    int mij,p=-1;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(a[mij]==x)
        {
            p=mij;
            st=mij+1;
        }
        else if(x<a[mij]) dr=mij-1;
        else st=mij+1;
    }
    return p;
}

int CB1(int st , int dr ,int x)
{
    int mij,p=-1;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(a[mij]<=x)
        {
            p=mij;
            st=mij+1;
        }
        else dr=mij-1;
    }
    return p;
}
int CB2(int st , int dr ,int x)
{
    int mij,p=-1;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(a[mij]>=x)
        {
            p=mij;
            dr=mij-1;
        }
        else st=mij+1;
    }
    return p;
}

int main()
{
    int n,i,op,q,x;

    ifstream fin ("cautbin.in");
    ofstream fout ("cautbin.out");
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>a[i];
    fin>>q;
    for(i=1;i<=q;i++)
    {
        fin>>op>>x;
        if(op==0)
            {
                fout<<CB0(1,n,x)<<"\n";
            }
        else if(op==1)
            {
                fout<<CB1(1,n,x)<<"\n";
            }
        else if(op==2)
            {
                fout<<CB2(1,n,x)<<"\n";
            }

    }
    fout.close();
    fin.close();
    return 0;
}