Cod sursa(job #1380084)

Utilizator Corina1997Todoran Ana-Corina Corina1997 Data 6 martie 2015 21:48:48
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.93 kb
#include <fstream>
#include <vector>
using namespace std;

ifstream is("cautbin.in");
ofstream os("cautbin.out");

int n, val, m;
vector<int> a;
int x, y, k;

int main()
{
    is >> n;
    a.resize(n+1);
    for ( int i = 1; i <= n; i++ )
        is >> a[i];
    for ( val = 1; val <= n; val <<= 1 );

    is >> m;
    for ( int i = 1; i <= m; i++ )
    {
        is >> x >> y;
        if ( x < 2 )
        {
            k = 0;
            for ( int j = val; j; j >>= 1 )
                if ( j + k <= n && a[j+k] <= y )
                    k += j;
            if ( x == 0 && a[k] != y )
                os << "-1\n";
            else
                os << k << '\n';
            continue;
        }
        k = n;
        for ( int j = val; j; j >>= 1 )
            if ( k - j > 0 && a[k - j] >= y )
                k -= j;
        os << k << '\n';
    }
    is.close();
    os.close();
    return 0;
}