Cod sursa(job #1493181)

Utilizator EuEricCiordel Rromeo EuEric Data 28 septembrie 2015 20:29:57
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.4 kb
#include<fstream>
using namespace std;
int v[100100];
int main()
{
    ifstream f("cautbin.in");
    ofstream g("cautbin.out");
    int n,m,x,i,a;
    f>>n;
    for(i=1;i<=n;++i)
       f>>v[i];
    f>>m;
    for(i=1;i<=m;++i)
    {
        int ans=-1;
        int st=1;
        int dr=n;
        f>>a>>x;
        if(a==1)
        {
            while(st<=dr)
            {
                int mij=(st+dr)/2;
                if(v[mij]<=x)
                {
                    ans=mij;
                    st=mij+1;
                }
                else
                    dr=mij-1;
            }
        }
        else if(a==0)
        {
            while(st<=dr)
            {
                int mij=(st+dr)/2;
                if(v[mij]<=x)
                {
                    if(v[mij]==x)
                        ans=mij;
                    st=mij+1;
                }
                else
                    dr=mij-1;
                }
            }
            else
            {
                    while(st<=dr)
                    {
                    int mij=(st+dr)/2;
                    if(v[mij]>=x)
                    {
                        ans=mij;
                        dr=mij-1;
                    }
                    else
                        st=mij+1;

                    }
            }
            g<<ans<<"\n";

    }
}