Cod sursa(job #1146605)

Utilizator roxana_97Soare Roxana Florentina roxana_97 Data 19 martie 2014 09:46:56
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.56 kb
#include<fstream>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int n,v[100009],x,tip,l,m,poz;

int cautare(int x)
{
    int st=1;int dr=n;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(v[mij]==x) return mij;
        else if(v[mij]<x) st=mij+1;
             else dr=mij-1;
    }
    return 0;
}

int cautare1(int x)
{
    int st=1;int dr=n;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(v[mij]==x) return mij;
        else if(v[mij]<x) st=mij+1;
             else dr=mij-1;
    }
    return dr;
}

int cautare2(int x)
{
    int st=1;int dr=n;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(v[mij]==x) return mij;
        else if(v[mij]<x) st=mij+1;
             else dr=mij-1;
    }
    return st;
}

int main()
{
    f>>n;
    for(int i=1;i<=n;++i) f>>v[i];
    f>>m;
    for(int i=1;i<=m;++i)
    {
        f>>tip>>x;
        if(tip==0)
        {
            poz=cautare(x);
           if(poz>0)
           {
               l=1;
               while(v[poz]==v[poz+l]) l++;
               g<<poz+l-1<<'\n';
           }
            else g<<-1<<'\n';
        }
        if(tip==1)
        {
            poz=cautare1(x);
               l=1;
               while(v[poz]==v[poz+l]) l++;
               g<<poz+l-1<<'\n';
        }
        if(tip==2)
        {
            poz=cautare2(x);
               l=1;
               while(v[poz]==v[poz-l]) l++;
               g<<poz-l+1<<'\n';
        }
    }
    f.close();g.close();
    return 0;
}