Cod sursa(job #2539486)

Utilizator NoodlesAndi Domnulete Noodles Data 5 februarie 2020 21:39:49
Problema Cautare binara Scor 40
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.55 kb
#include <fstream>
using namespace std;

ifstream f1("cautbin.in");
ofstream f2("cautbin.out");
const int NMAX = 100005;
int v[NMAX], mid, lb, ub, i, optiune, x, N, M;



void catareBinara(int x){
    lb = 1;
    ub = N;
    while(lb <= ub)
    {
        mid = lb + (ub - lb) / 2;
        if(v[mid] == x)
            break;
        else if(v[mid] > x)
            ub = mid - 1;
        else if(v[mid] < x)
            lb = mid + 1;
    }
}


int main()
{
    f1 >> N;
    for(i = 1; i <= N; i++)
    {
        f1 >> v[i];
    }
    f1 >> M;

    for(i = 1; i <= M; ++i)
    {
        f1 >> optiune >> x;
        if(optiune == 0)
        {
            catareBinara(x);
            if(v[mid] == x)
            {
                while(v[mid + 1] == x)
                    mid++;
                f2 << mid << endl;
            }
            else
                f2 << -1 << endl;
        }
        if(optiune == 1)
        {
            catareBinara(x);
            if(v[mid] == x)
            {
                while(v[mid + 1] == x)
                    mid++;
            }
            else if(v[mid] > x)
                mid--;
            f2 << mid << endl;
        }
        if(optiune == 2)
        {
            catareBinara(x);
            if(v[mid] == x)
            {
                while(v[mid - 1] == v[mid])
                    mid--;
            }
            else if(v[mid] < x)
                mid++;
            f2 << mid << endl;
        }
    }
    f1.close();
    f2.close();
    return 0;
}