Cod sursa(job #2739272)

Utilizator ana_madalina_18Radu Ana Madalina ana_madalina_18 Data 7 aprilie 2021 14:45:10
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.38 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)
{
    int mij;
    mij=(st+dr)/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)/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)/2;
    if(st<=dr)
    {if(x==v[mij]) r=mij;
    if(v[mij]<x && st<=dr)
        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;
                caut_bin1(x,1,n);
                fout<<r<<'\n';
            }
            else
            {
                 r=-1;
                caut_bin2(x,1,n);
                fout<<r<<'\n';
            }
        }
    }
    return 0;
}