Cod sursa(job #2066075)

Utilizator mirunaFmiruna mirunaF Data 14 noiembrie 2017 18:07:05
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.21 kb
#include <iostream>
#include <fstream>

using namespace std;

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

const int N=100001,L=16;
int  n ,v[N];

int caut_bin0(int x)
{
    int pas = 1<<L, r=0;
    while ( pas!=0)
    {
        if( pas+r <= n && v[r+pas] <= x)
        {
            r+=pas;
        }
        pas/=2;
    }
    if(v[r]!=x)
        return -1;
    else return r ;
}

int caut_bin2(int x)
{
    int pas = 1<<L, r=0;
    while ( pas!=0 )
    {
        if(pas+r <= n && v[r+pas] < x)
        {
            r+= pas;
        }
        pas/=2;
    }
    return r+1;
}

int caut_bin1 (int x)
{
    int pas = 1<<L, r=0;
    while ( pas!=0)
    {
        if( pas+r <= n && v[r+pas] <= x)
        {
            r+=pas;
        }
        pas/=2;
    }
    return r ;
}

int main()
{
    int i,x,m,y;
    in>>n;
    for(i=1; i<=n; i++)
        in>>v[i];
    in>>m;
    while(m!=0)
    {
        in>>y;
        in>>x;
        if(y==0)
            out<<caut_bin0(x)<<"\n";
        else
        {
            if(y==1)
                out<<caut_bin1(x)<<"\n" ;
            else out<<caut_bin2(x)<<"\n" ;
        }
        m--;
    }
    return 0;
}