Cod sursa(job #2477055)

Utilizator emanuel27iIonescu Emanuel emanuel27i Data 19 octombrie 2019 16:42:07
Problema Cautare binara Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.44 kb
#include <fstream>
#include <iostream>

using namespace std;

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

int v[100001];

int cb (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 cb2 (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 cb3 (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,x,c;
    fin>>n;
    for(int i=0;i<n;i++)
        fin>>v[i];
    fin>>m;
    for(int i=0;i<m;i++)
    {
        fin>>c>>x;
        switch(c)
        {
        case 0:
                fout<<cb(0,n-1,x)<<"\n";
                break;
            case 1:

                fout<<cb2(0,n-1,x)<<"\n";
                break;
            case 2:
                fout<<cb3(0,n-1,x)<<"\n";
                break;
        }

    }
    return 0;
}