Cod sursa(job #1180941)

Utilizator ArchazeyBaltatu Andrei-Mircea Archazey Data 1 mai 2014 14:32:02
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.13 kb
#include<fstream>
using namespace std;

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

int n,a[100005],m;

int main()
{
    int i,j,x,y,step;
    fin>>n;
    for (i=1;i<=n;i++)
        fin>>a[i];
    fin>>m;
    for (j=1;j<=m;j++)
        {
         fin>>x>>y;
         if (x==0)
            {
                for (step=1;step<=n;step<<=1);
                for (i=0;step;step>>=1)
                    if (i+step<=n && a[i+step]<=y)
                        i+=step;
                if (a[i]==y)
                 fout<<i<<"\n";
                else fout<<"-1\n";
            }
         if (x==1)
            {
               for (step=1;step<=n;step<<=1);
                for (i=0;step;step>>=1)
                    if (i+step<=n && a[i+step]<=y)
                        i+=step;
                fout<<i<<"\n";
            }
         if (x==2)
            {
                for (step=1;step<=n;step<<=1);
                for (i=n;step;step>>=1)
                    if (i-step>=1 && a[i-step]>=y)
                        i-=step;
                fout<<i<<"\n";
            }
        }
    return 0;
}