Cod sursa(job #437102)

Utilizator alexandru92alexandru alexandru92 Data 9 aprilie 2010 12:55:34
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.56 kb
/* 
 * File:   main.cpp
 * Author: VirtualDemon
 *
 * Created on April 9, 2010, 11:39 AM
 */
#include <cstdlib>
#include <fstream>
#define Nmax 100111

/*
 * 
 */
using namespace std;
int main(int argc, char** argv)
{
    int v[Nmax];
    int N, M, i, j, left, right, middle, p;
    ifstream in( "cautbin.in" );
    ofstream out( "cautbin.out" );
    in>>N;
    for( i=1; i <= N; in>>v[i], ++i );
    for( in>>M; M; --M )
    {
        in>>i>>j;
        p=-1; left=1; right=N;
        if( !i )
        {
            while( left <= right )
            {
                middle=left+(right-left)/2;
                if( j == v[middle] )
                {
                    for( p=left; j == v[p+1]; ++p );
                    break;
                }
                if( j <= v[middle] )
                    right=middle-1;
                else left=middle+1;
            }
        }
        else if( 1 == i )
             {
                    while( left < right )
                    {
                        middle=left+(right-left)/2;
                        if( j < v[middle] )
                            right=middle;
                        else p=middle, left=middle+1;
                    }
            }
            else {
                     while( left < right )
                     {
                         middle=left+(right-left)/2;
                         if( j <= v[middle] )
                             p=middle, right=middle;
                         else left=middle+1;
                     }
                }
        out<<p<<'\n';
    }
    return EXIT_SUCCESS;
}