Cod sursa(job #2414143)

Utilizator zimbabueMariana Rusu zimbabue Data 24 aprilie 2019 11:07:47
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.11 kb
#include <fstream>

using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");
int n,a[100003],poz,mij,m,c,x,i,j,st,dr;
int cautbin0(int x)
{
    st=1;dr=n;poz=-1;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(a[mij]<=x)
            st=mij+1,poz=mij;
        else
            dr=mij-1;
    }
    if(a[poz]!=x)
        return -1;
    return poz;
}
int cautbin1(int x)
{
    st=1;dr=n;poz=1;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(a[mij]<=x)
            st=mij+1,poz=mij;
        else
            dr=mij-1;
    }
    return poz;
}
int cautbin2(int x)
{
    st=1;dr=n;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(a[mij]>=x)
            dr=mij-1,poz=mij;
        else
            st=mij+1;
    }
    return poz;
}
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
        f>>a[i];
    f>>m;
    for(i=1;i<=m;i++)
    {
        f>>c>>x;
        if(c==0)
            g<<cautbin0(x)<<'\n';
        else
        if(c==1)
            g<<cautbin1(x)<<'\n';
        else
            g<<cautbin2(x)<<'\n';
    }
    return 0;
}