Cod sursa(job #2066102)

Utilizator ioana_99Ioana Marin ioana_99 Data 14 noiembrie 2017 18:18:10
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.78 kb
#include <iostream>
#include <fstream>

using namespace std;

ifstream f("cautbin.in");
ofstream g("cautbin.out");
/*  //cautbinara : a<<b=a*2^b;
      pas=1<<l;
         r=0;
         while(pas!=0)
         {
             if(r+pas are propr)
             {
                 r+=pas;
             }
             pas/=2; //pas>>1
         }
         r este ultimul care are propr*/

const int N=100010;
int v[N],x,n,m,pas,r,l,nr_probl,i;

int caut_bin_0()
{
    pas=1<<l;
            r=0;
            while(pas!=0)
            {
                if(r+pas<=n && v[r+pas]<=x)
                {
                    r+=pas;
                }
                pas/=2;
            }
            if(v[r]!=x)
            {
                return -1;
            }
            else
                return r;
}
int caut_bin_1()
{
  pas=1<<l;
            r=0;
            while(pas!=0)
            {
                if(r+pas<=n && v[r+pas]<=x)
                {
                    r+=pas;
                }
                pas/=2;
            }
            return r;
}
int caut_bin_2()
{
   pas=1<<l;
            r=0;
            while(pas!=0)
            {
                if(r+pas<=n && v[r+pas]<x)
                {
                    r+=pas;
                }
                pas/=2;
            }
            r++;
            return r;
}
int main()
{
    l=16;
    f>>n;
    for(i=1; i<=n; i++)
        f>>v[i];
    f>>m;
    for(i=1; i<=m; i++)
    {
        f>>nr_probl>>x;
        if(nr_probl==0)
        {
            g<<caut_bin_0()<<"\n";
        }
        if(nr_probl==1)
        {
           g<<caut_bin_1()<<"\n";
        }
        if(nr_probl==2)
        {
            g<<caut_bin_2()<<"\n";
        }
    }
    return 0;
}