Cod sursa(job #2241478)

Utilizator Ionut228Ionut Calofir Ionut228 Data 16 septembrie 2018 01:36:31
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.19 kb
#include <fstream>
 
using namespace std;
 
ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
 
int N, M;
int V[100005];
 
int cautbin0(int x)
{
    int l = 0, r = N + 1;
    while (r - l > 1)
    {
        int mid = (l + r) / 2;
        if (V[mid] > x)
            r = mid;
        else
            l = mid;
    }
    if (V[l] != x)
        return -1;
    return l;
}
 
int cautbin1(int x)
{
    int l = 0, r = N + 1;
    while (r - l > 1)
    {
        int mid = (l + r) / 2;
        if (V[mid] > x)
            r = mid;
        else
            l = mid;
    }
    return l;
}
 
int cautbin2(int x)
{
    int l = 0, r = N + 1;
    while (r - l > 1)
    {
        int mid = (l + r) / 2;
        if (V[mid] >= x)
            r = mid;
        else
            l = mid;
    }
    return r;
}
 
int main()
{
    fin >> N;
    for (int i = 1; i <= N; ++i)
        fin >> V[i];
    fin >> M;
    for (int i = 1; i <= M; ++i)
    {
        int t, x;
        fin >> t >> x;
        if (t == 0)
            fout << cautbin0(x);
        else if (t == 1)
            fout << cautbin1(x);
        else if (t == 2)
            fout << cautbin2(x);
        fout << '\n';
    }
    fin.close();
    fout.close();
    return 0;
}