Cod sursa(job #2145038)

Utilizator tanasaradutanasaradu tanasaradu Data 27 februarie 2018 01:27:10
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.66 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin ("cautbin.in");
ofstream fout ("cautbin.out");
const int Nmax = 100005;
int n, Q, a[Nmax];
inline void Actualizare(int & x, int & y, int p)
{
    x = 1;
    y = n;
    p = - 1;
}
int main()
{
    int x, op, stg, drp, poz, mij;
    fin >> n;
    for(int i = 1 ; i <= n ; i++)
    {
        fin >> x;
        a[i] = x;
    }
    fin >> Q;
    while(Q -- )
    {
        fin >> op >> x;
        Actualizare(stg, drp, poz);
        if(op == 0)
        {
            while(stg <= drp)
            {
                mij = (stg + drp) / 2;
                if(a[mij] == x)
                {
                    poz = mij;
                    stg = mij + 1;
                }
                else if(a[mij] < x)
                    stg = mij + 1;
                else drp = mij - 1;
            }
            fout << poz << "\n";
        }
        else if(op == 1)
        {
            while(stg <= drp)
            {
                mij = (stg + drp) / 2;
                if(a[mij] <= x)
                {
                    poz = mij;
                    stg = mij + 1;
                }
                else drp = mij - 1;
            }
            fout << poz << "\n";
        }
        else
        {
            while(stg <= drp)
            {
                mij = (stg + drp) / 2;
                if(a[mij] >= x)
                {
                    poz = mij;
                    drp = mij - 1;
                }
                else stg = mij + 1;
            }
            fout << poz << "\n";
        }
    }
    fin.close();
    fout.close();
    return 0;
}