Cod sursa(job #2705706)

Utilizator Tudor_StefanaStefana Tudor Tudor_Stefana Data 13 februarie 2021 10:13:36
Problema Statistici de ordine Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.75 kb
#include <bits/stdc++.h>
using namespace std;

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

int v[3000003], n, k;

int QSort(int st, int dr)
{
    int i, j, piv;
    j = (st + dr) / 2;
    swap(v[j], v[st]);
    piv = v[st];
    j = st;
    for (i = st + 1; i <= dr; i++)
        if (v[i] <= piv)
        {
            j++;
            swap(v[i], v[j]);
        }
    swap(v[st], v[j]);
    return j;
}

int Cauta(int st, int dr)
{
    int p = QSort(st, dr);
    if (p == k) return v[p];
    if (p < k) return Cauta(p + 1, dr);
    return Cauta(st, p - 1);
}

void Citire()
{
    fin >> n >> k;
    for (int i = 1; i <= n; i++)
        fin >> v[i];
}

int main()
{
    Citire();
    fout << Cauta(1, n);
    return 0;
}