Cod sursa(job #2063846)

Utilizator BogyyBogdan Rusu Bogyy Data 11 noiembrie 2017 15:41:15
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.6 kb
#include <fstream>
using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int x[100001];
int main()
{
    int n,m,i,j,k,y;
    f>>n;
    for(i=1;i<=n;i++)
        f>>x[i];
    f>>m;
    for(i=1;i<=m;i++)
    {
        f>>k>>y;
        int mij;
        if(k==0)
        {
            int st=1, dr=n;
            while(st<=dr)
            {
                mij=(dr+st)/2;
//                g<<mij<<" "<<st<<" "<<dr<<"\n";
                if(x[mij]<=y)
                    st=mij+1;
                else if(x[mij]>y)
                    dr=mij-1;
//                else if(x[mij]==y)
//                    break;

            }
            mij=(st+dr)/2;
//            g<<mij;
            if(x[mij]==y)
                g<<mij<<"\n";
            else
                g<<"-1";

        }
        if(k==1)
        {
            int st=1, dr=n;
            while(st<dr)
            {
                int mij=(dr+st)/2;
                if(x[mij]>y)
                    dr=mij;
                if(x[mij]<=y)
                    st=mij+1;
            }
            mij=(dr+st)/2;
            if(x[mij]>y)
                mij--;
            g<<mij<<"\n";
        }
        if(k==2)
        {
            int st=1, dr=n;
            while(st<dr)
            {
                int mij=(dr+st)/2;
                if(x[mij]>=y)
                    dr=mij;
                if(x[mij]<y)
                    st=mij+1;
            }
            mij=(dr+st)/2;
            if(x[mij]<y)
                mij++;
            g<<mij<<"\n";
        }
    }
    return 0;
}