Cod sursa(job #2941115)

Utilizator Andu0109Voinea Alexandru Iurie Andu0109 Data 17 noiembrie 2022 10:05:04
Problema Cautare binara Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.25 kb
#include <fstream>

using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int c,n,x,st,m,dr,a[100005],poz,b,i;
int cautbin0(int x,int n,int a[])
{
    int st=1,dr=n,poz=-1,m;
    while(st<=dr)
    {
        m=(st+dr)/2;
        if(a[m]==x)
        {
            poz=m;
            st=m+1;
        }
        else dr=m-1;
    }
    return poz;
}
int cautbin1(int x,int n,int a[])
{
    int st=1,dr=n,poz=0,m;
    while(st<=dr)
    {
        m=(st+dr)/2;
        if(a[m]<=x)
        {
            poz=m;
            st=m+1;
        }
        else dr=m-1;
    }
    return poz;
}
int cautbin2(int x,int n,int a[])
{
    int st=1,dr=n,poz=0,m;
    while(st<=dr)
    {
        m=(st+dr)/2;
        if(a[m]>=x)
        {
            poz=m;
            dr=m-1;
        }
        else st=m+1;
    }
    return poz;
}
int main()
{
    fin>>n;
    for(i=1; i<=n; i++)
    {
        fin>>a[i];
    }
    fin>>b;
    for(i=1; i<=b; i++)
    {
        fin>>c>>x;
        if(c==0)
        {
            fout<<cautbin0(x,n,a);
        }
        else if(c==1)
        {
            fout<<cautbin1(x,n,a);
        }
        else fout<<cautbin2(x,n,a);
        fout<<'\n';
    }
    return 0;
}