Cod sursa(job #2409753)

Utilizator theodor1289Theodor Amariucai theodor1289 Data 19 aprilie 2019 13:06:12
Problema Sortare prin comparare Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.09 kb
#include<bits/stdc++.h>
using namespace std;
ifstream fin("algsort.in");
ofstream fout("algsort.out");
int a[500005], n;

void heapify(int arr[], int n, int i) {
    int largest = i;
    int l = 2*i + 1;
    int r = 2*i + 2;
    if (l < n && arr[l] > arr[largest]) {
        largest = l;
    }
    if (r < n && arr[r] > arr[largest]) {
        largest = r;
    }
    if (largest != i) {
        swap(arr[largest], arr[i]);
        heapify(arr, n, largest);
    }	
}

void removemax(int arr[], int n)
{
    for (int i = n - 1; i >= 0; i--) {
        swap(arr[0], arr[i]);
        heapify(arr, i, 0);
    }	
}

void buildheap(int arr[], int n)
{
    //for (int i = n / 2 - 1; i >= 0; i--) {
     //   heapify(arr, n, i);
    //}
    for (int i = 0; i <= n / 2 - 1; i++) {
        heapify(arr, n, i);
    }
}

void heapSort(int arr[], int n) {
    
    buildheap(arr, n);

    removemax(arr, n);

}
	
int main(){ 
	
    fin >> n;
    for (int i = 0; i < n; i++) {
        fin >> a[i];
    }

    heapSort(a, n);

    for (int i = 0; i < n - 1; i++) {
        cout << a[i] << ' ';
    }
    cout<<a[n-1];
    return 0;
}