Cod sursa(job #2805977)

Utilizator victorzarzuZarzu Victor victorzarzu Data 22 noiembrie 2021 10:51:10
Problema Sortare prin comparare Scor 40
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.71 kb
#include <bits/stdc++.h>

using namespace std;
ifstream f("algsort.in");
ofstream g("algsort.out");
int n, a[500001];

int partition(int a[], int l, int r)
{
  int pivot = a[r];
  int index = l - 1;
  for(int j = l;j < r;++j)
    if(a[j] <= pivot)
    {
      index++;
      swap(a[index], a[j]);
    }
  swap(a[index + 1], a[r]);
  return index + 1;
}

void quicksort(int a[], int l, int r)
{
  if(l < r)
  {
    int q = partition(a, l, r);
    quicksort(a, l, q - 1);
    quicksort(a, q + 1, r);
  } 
}

void read()
{
  f>>n;
  for(int i = 1;i <= n;++i)
    f>>a[i];
}

int main()
{
  read();
  quicksort(a, 1, n);
  for(int i = 1;i <= n;++i)
    g<<a[i]<<" ";
  return 0;
}