Cod sursa(job #2278477)

Utilizator LitaMihaiLita Mihai Alexandru LitaMihai Data 8 noiembrie 2018 08:30:18
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.33 kb
#include<fstream>
using namespace std;
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;
    ifstream f("cautbin.in");
    ofstream g("cautbin.out");
    f>>n;
    for (i = 1; i <= n; ++ i)
        f>>v[i];

    f>>m;

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