Cod sursa(job #2494320)

Utilizator IustinHoratiuIustin Horatiu IustinHoratiu Data 17 noiembrie 2019 18:01:09
Problema Cautare binara Scor 40
Compilator cpp-32 Status done
Runda Arhiva educationala Marime 1.47 kb
#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
#define N 100010
int v[N];

int bsearch0 (int p, int u, int key) {
    int m;

    while (p <= u) {
        m = (p + u) / 2;
        if (v[m] <= key)
            p = m + 1;
        else
            u = m - 1;
    }
    m = (p + u) / 2;

    if (v[m] > key) m --;
    if (v[m] == key)
        return m;
    return -1;
}

int bsearch1 (int p, int u, int key) {
    int m, n = u;

    while (p < u){
        m = (p + u) / 2;
        if (v[m] <= key)
            p = m + 1;
        else
            u = m;
    }

    m = (p + u) / 2;
    if (v[m] > key)
       -- m;
    return m;
}

int bsearch2 (int p, int u, int key) {
    int m;

    while (p < u) {
        m = (p + u) / 2;
        if (v[m] < key)
            p = m + 1;
        else
            u = m;
    }

    m = (p + u) / 2;
    if (v[m] < key)
       ++ m;
    return m;
}

int main()
{
    int i, n, m, tip, val;
    fin >> n;
    for (int i=1;i<=n;i++)
    {
        fin >> v[i];
    }

    fin >> m;
    while (m --)
    {
        fin >> tip;
        fin >> val;
        if (tip == 0)
             fout << bsearch0(1, n, val) << endl;
          if (tip == 1)
             fout << bsearch1(1, n, val) << endl;
        if (tip == 2)
             fout << bsearch2(1, n, val) << endl;
     }
    cout << "Hello world!" << endl;
    return 0;
}