Cod sursa(job #2624235)

Utilizator anayepAna-Maria Ungureanu anayep Data 4 iunie 2020 17:03:55
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.32 kb

#include <fstream>

using namespace std;

ifstream f("cautbin.in");
ofstream g("cautbin.out");
int v[100010];

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;

    f>>n;
    for (i = 1; i <= n; ++ i)
        f>>v[i];

    f>>m;

    while (m --){
          f>>tip;
          f>>val;
          if (tip == 0)
             g<<bsearch0(1, n, val);
          if (tip == 1)
             g<<bsearch1(1, n, val);
          if (tip == 2)
             g<<bsearch2(1, n, val);
    }

}