Cod sursa(job #2613665)

Utilizator georgeblanarBlanar George georgeblanar Data 10 mai 2020 14:07:16
Problema Cautare binara Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.32 kb
#include <fstream>
#include <iostream>
#define N 100010
std::ifstream f("cautbin.in");
std::ofstream g("cautbin.out");
int n, m, 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 + 1;
    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 + 1;
}

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 + 1;
}
int main()
{
	
	f >> n;
	for (int i = 0; i < n; i++)
		f >> v[i];
	f >> m;
	while (m --)
	{
		int tip, x;
		f >> tip;
		f >> x;
		if (tip == 0)
		{
			g << bsearch0(0, n - 1, x)	<< '\n';
		}
		if (tip == 1) {
			g << bsearch1(0, n - 1, x) << '\n';
		}
		if (tip == 2) {
			g << bsearch2(0, n - 1, x) << '\n';
		}

	}
}