Cod sursa(job #2808207)

Utilizator victorzarzuZarzu Victor victorzarzu Data 24 noiembrie 2021 18:23:21
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.89 kb
#include <bits/stdc++.h>
#define get_byte(x) ((x >> (8 * byte)) & 255)

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

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

void countsort(int *a1, int *a2, int byte)
{
  int counter[1 << 8];
  int index[1 << 8];

  memset(counter, 0, sizeof(counter));

  for(int i = 1;i <= n;++i)
    counter[get_byte(a1[i])]++;
  
  index[0] = 1;
  for(int i = 1;i < (1 << 8);++i)
    index[i] = index[i - 1] + counter[i - 1];
  
  for(int i = 1;i <= n;++i)
    a2[index[get_byte(a1[i])]++] = a1[i];
}

void solve()
{
  int *tmp = new int[n + 1];
  for(int i = 0;i < 4;++i)
    if(i & 1)
      countsort(tmp, a, i);
    else 
      countsort(a, tmp, i);

  delete tmp;

  for(int i = 1;i <= n;++i)
    g<<a[i]<<" ";
}

int main()
{
  read();
  solve();
  return 0;
}