Cod sursa(job #1075352)

Utilizator assa98Andrei Stanciu assa98 Data 8 ianuarie 2014 21:26:47
Problema Cautare binara Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.44 kb
#include <iostream>
#include <fstream>
using namespace std;

int v[100100];

int main() {

    ifstream in("cautbin.in");
    ofstream out("cautbin.out");
    int n,m,i,x,y;
    in>>n;
    for(i=1;i<=n;i++)
    {
        in>>v[i];
    }
    in>>m;
    for(i=1;i<=m;i++)
    {
        in>>x>>y;
        int st=1;
        int dr=n;
        int ans=-1;
        if(x==1)
        {
            while(st<=dr)
            {
                int mij=(st+dr)/2;
                if(v[mij]<=y)
                {
                    ans=mij;
                    st=mij+1;
                }
                    else
                    {
                        dr=mij-1;
                    }
            }
        }
        else if(x==2)
        {
            while(st<=dr)
            {
                int mij=(st+dr)/2;
                if(v[mij]>=y)
                {
                    ans=mij;
                    dr=mij-1;
                }
                    else
                    {
                        st=mij+1;
                    }
            }
        }
        else
        {
            while(st<=dr)
            {
                int mij=(st+dr)/2;
                if(v[mij]<=y)
                {
                    if(v[mij]==y) ans=mij;
                    st=mij+1;
                }
                    else
                    {
                        dr=mij-1;
                    }
            }
        }
        out<<ans<<endl;

    }

    return 0;
}