Cod sursa(job #1074739)

Utilizator PaueyPaula Nicoleta Gradu Pauey Data 7 ianuarie 2014 21:57:37
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.68 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;
                        st=mij-1;
                    }
                        else
                        {
                            dr=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;
}