Cod sursa(job #2377253)

Utilizator Narcis_SimbuanNarcis Simbuan Narcis_Simbuan Data 9 martie 2019 04:02:35
Problema Cautare binara Scor 40
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.4 kb
#include <fstream>
#include <stdlib.h>
#define N 100010

using namespace std;

ifstream fin("cautbin.in");
ofstream fout("cautbin.out");

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 n, m, tip, val;
    fin>>n;
    for (int i = 1; i <= n; ++i)
        fin>>v[i];
    fin>>m;
    while (m--)
    {
        fin>>tip>>val;
        if (tip == 0)
            fout<<bsearch0(1, n, val)<<endl;
        else if (tip == 1)
            fout<<bsearch1(1, n, val)<<endl;
        else if (tip == 2)
            fout<<bsearch2(1, n, val)<<endl;
    }
    return 0;
}