Cod sursa(job #3302722)

Utilizator vladinfo_Grecu Vlad vladinfo_ Data 10 iulie 2025 13:03:03
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 2.26 kb
#include <bits/stdc++.h>
/// Template Dutzu

using namespace std;

ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int v[100001],x;
int cautbin0(int st, int dr)
{
    if (st==dr and v[st]==x)
        return st;
        else if (st==dr)
            return -1;
    int mij=st+(dr-st+1)/2;
        if (v[mij]<=x)
           cautbin0(mij,dr);
        else
            cautbin0(st,mij-1);
}
int cautbin1(int st, int dr)
{
    if (st==dr)
        return st;
    int mij=st+(dr-st+1)/2;;
        if (v[mij]<=x)
           cautbin1(mij,dr);
        else
            cautbin1(st,mij-1);
}
int cautbin2(int st, int dr)
{
    if (st==dr)
        return st;
    int mij=st+(dr-st)/2;
        if (v[mij]<x)
           cautbin2(mij+1,dr);
        else
            cautbin2(st,mij);
}
int main()
{

    int n,m;
    fin>>n;
    for (int i=1;i<=n;i++)
        fin>>v[i];
    fin>>m;
    for (int i=1;i<=m;i++)
    {
        int a;
        fin>>a>>x;
        if (a==0)
        {
            int st=1,dr=n,mij,rez=-1;
            while(st<=dr)
            {
                mij=1LL*(st+dr)/2;
                if (v[mij]<=x)
                {
                    st=mij+1;
                    if (v[mij]==x)
                    rez=mij;
                }
                else
                    dr=mij-1;
            }
            cout<<rez<<'\n';
        }
        if (a==1)
        {
            int st=1,dr=n,mij,rez;
            while(st<=dr)
            {
                mij=1LL*(st+dr)/2;
                if (v[mij]<=x)
                {
                    st=mij+1;
                    rez=mij;
                }
                else
                    dr=mij-1;
            }
            cout<<rez<<'\n';
        }
        if (a==2)
        {
            int st=1,dr=n,mij,rez;
            while(st<=dr)
            {
                mij=1LL*(st+dr)/2;
                if (v[mij]<x)
                {
                    st=mij+1;
                    if (v[mij+1]==x)
                    rez=mij+1;
                    else
                        rez=mij;
                }
                else
                    dr=mij-1;
            }
            cout<<rez<<'\n';
        }
    }
    return 0;
}