Cod sursa(job #1861959)

Utilizator ionut98Bejenariu Ionut Daniel ionut98 Data 29 ianuarie 2017 13:51:02
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.08 kb
#include<fstream>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int n,x[100010],i,m,a,b,poz;
int cautbin1(int val)
{
    int st,dr,mij,last=-1;
    st=1;
    dr=n;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(val>=x[mij])
        {
            last=mij;
            st=mij+1;
        }
        else
          dr=mij-1;
    }
    return last;
}
int cautbin3(int val)
{
    int st,dr,last=-1,mij;
    st=1;
    dr=n;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(val<=x[mij])
        {
            last=mij;
            dr=mij-1;
        }
        else
          st=mij+1;
    }
    return last;
}
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
      f>>x[i];
    f>>m;
    for(i=1;i<=m;i++)
    {
        f>>a>>b;
        poz=cautbin1(b);
        if(a==0)
        {
            if(x[poz]==b)
              g<<poz<<"\n";
            else
              g<<-1<<"\n";
        }
        else if(a==1)
          g<<poz<<"\n";
        else
          g<<cautbin3(b)<<"\n";
    }
    return 0;
}