Cod sursa(job #1005498)

Utilizator iordache.bogdanIordache Ioan-Bogdan iordache.bogdan Data 5 octombrie 2013 10:03:42
Problema Cautare binara Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.8 kb
#include <fstream>
using namespace std;

int n,m,i,poz,q,nr,st,dr,v[100005];
bool ok,ok1;

int main()
{
    ifstream f("cautbin.in");
    ofstream g("cautbin.out");
    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];
    f>>m;
    for(i=1;i<=m;i++)
    {
        f>>q;f>>nr;
        st=1;dr=n;
        ok=1;ok1=1;
        while(ok)
        {
            if(st==dr-1)
            {
                if(v[st]==nr)
                    poz=st;
                else
                if(v[dr]==nr)
                    poz=dr;
                else
                {
                    ok1=0;poz=st;
                }
                ok=0;
            }
            else
            if(nr>v[(dr+st)/2])
            {
                st=(dr+st)/2;
            }
            else
            if(nr<v[(dr+st)/2])
            {
                dr=(dr+st)/2;
            }
            else
            if(nr==v[(dr+st)/2])
            {
                poz=(dr+st)/2;
                ok=0;
            }
        }
        if(q==0)
        {
            if(ok1==0)
                g<<"-1"<<"\n";
            else
            {
                while(v[poz]==nr)
                    poz++;
                g<<poz-1<<"\n";
            }
        }
        else
        if(q==1)
        {
            if(ok1==0)
                g<<poz<<"\n";
            else
            {
                while(v[poz]==nr)
                    poz++;
                g<<poz-1<<"\n";
            }
        }
        else
        if(q==2)
        {
            if(ok1==0)
                g<<poz+1<<"\n";
            else
            {
                while(v[poz]==nr)
                    poz--;
                g<<poz+1<<"\n";
            }
        }
    }
    f.close();g.close();
    return 0;
}