Cod sursa(job #2739811)

Utilizator ana_madalina_18Radu Ana Madalina ana_madalina_18 Data 10 aprilie 2021 10:30:33
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.63 kb
#include <fstream>

using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int v[100009],r=-1;
int caut_bin(int x,int st,int dr)
{
    long long mij;
    mij=st+(dr-st)/2;
    if(st<=dr)
    {
        if(x==v[mij])
            r=mij;

        if(v[mij]<=x)
            return caut_bin(x,mij+1,dr);
        else
            return caut_bin(x,st,mij-1);
    }
}
int caut_bin1(int x,int st,int dr)
{
    int mij;
    mij=st+(dr-st)/2;
    if(st<=dr)
    {
        if(x>=v[mij]) r=mij;
        if(v[mij]<=x)
            return caut_bin(x,mij+1,dr);
        else
            return caut_bin(x,st,mij-1);
    }
}
int caut_bin2(int x,int st,int dr)
{
    int mij;
    mij=st+(dr-st)/2;
    if(st<=dr)
    {
        if(x<=v[mij]) r=mij;
        if(v[mij]<x)
            return caut_bin(x,mij+1,dr);
        else
            return caut_bin(x,st,mij-1);
    }
}
int main()
{
    int n,m,i,op,x;
    fin>>n;
    for(i=1; i<=n; i++)
    {
        fin>>v[i];
    }
    fin>>m;
    for(i=1; i<=m; i++)
    {
        fin>>op>>x;
        if(op==0)
        {
            r=-1;
            caut_bin(x,1,n);
            fout<<r<<'\n';
        }
        else
        {
            if(op==1)
            {
                r=-1;
                if(x>=v[n]) fout<<n<<'\n';
                else
                {
                    caut_bin1(x,1,n);
                    fout<<r<<'\n';
                }
            }
            else
            {
                r=-1;
                caut_bin2(x,1,n);
                fout<<r<<'\n';
            }
        }
    }
    return 0;
}