Cod sursa(job #1996623)

Utilizator MaligMamaliga cu smantana Malig Data 2 iulie 2017 08:35:45
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.24 kb
#include <iostream>
#include <fstream>
#include <unordered_map>
#include <algorithm>
#include <stack>
#include <cstring>

using namespace std;
ifstream in("algsort.in");
ofstream out("algsort.out");
const int NMax = 5e5 + 5;

int N;
int v[NMax];

void heapSort();

int main() {
    in>>N;
    for (int i=1;i <= N;++i) {
        in>>v[i];
    }

    heapSort();

    for (int i=1;i <= N;++i) {
        out<<v[i]<<' ';
    }

    in.close();out.close();
    return 0;
}

void sift(int node,int lim) {
    int son = 0;
    do {
        son = 0;
        int fs = node<<1, ss = fs + 1;
        if (fs <= lim) {
            son = fs;
            if (ss <= lim && v[ss] > v[fs]) {
                son = ss;
            }
        }

        if (son && v[son] > v[node]) {
            swap(v[son],v[node]);
            node = son;
        }
        else {
            son = 0;
        }
    }
    while (son);
}

void buildHeap() {
    for (int i=N/2; i ;--i) {
        sift(i,N);
    }
}

void heapSort() {
    buildHeap();

    /*
    for (int i=1; i<= N;++i) {
        cout<<v[i]<<' ';
    }
    */

    int i = N;
    while (i > 1) {
        swap(v[1],v[i]);
        --i;
        sift(1,i);
    }
}