Cod sursa(job #2984015)

Utilizator corinarobuRobu Corina corinarobu Data 23 februarie 2023 13:29:01
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.07 kb
#include <iostream>
#include <fstream>
using namespace std;


void merge(int arr[], int p, int q, int r) {


  int n1 = q - p + 1;
  int n2 = r - q;

  int L[n1], M[n2];

  for (int i = 0; i < n1; i++)
    L[i] = arr[p + i];
  for (int j = 0; j < n2; j++)
    M[j] = arr[q + 1 + j];


  int i, j, k;
  i = 0;
  j = 0;
  k = p;


  while (i < n1 && j < n2) {
    if (L[i] <= M[j]) {
      arr[k] = L[i];
      i++;
    } else {
      arr[k] = M[j];
      j++;
    }
    k++;
  }


  while (i < n1) {
    arr[k] = L[i];
    i++;
    k++;
  }

  while (j < n2) {
    arr[k] = M[j];
    j++;
    k++;
  }
}


void mergeSort(int arr[], int l, int r) {
  if (l < r) {
    int m = l + (r - l) / 2;

    mergeSort(arr, l, m);
    mergeSort(arr, m + 1, r);


    merge(arr, l, m, r);
  }
}

int main() {
  int n, v[500000];
  ifstream f("algsort.in");
  ofstream g("algsort.out");
  f>>n;
  for (int i=1;i<=n;i++)
  {
      f>>v[i];
  }
  mergeSort(v,1,n);
  for (int i=1;i<=n;i++)
  {
      g<<v[i]<<" ";
  }
  return 0;
}