Cod sursa(job #3128883)

Utilizator IsaacAvramescu Isaac Sebastian Isaac Data 11 mai 2023 11:43:36
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.63 kb
#include <stdio.h>
#include <stdlib.h>
#include <fstream>

using namespace std;

ifstream in("algsort.in");
ofstream out("algsort.out");
void merge(int arr[], int l, int m, int r)
{
	int i, j, k;
	int n1 = m - l + 1;
	int n2 = r - m;

	/* create temp arrays */
	int L[n1], R[n2];

	/* Copy data to temp arrays L[] and R[] */
	for (i = 0; i < n1; i++)
		L[i] = arr[l + i];
	for (j = 0; j < n2; j++)
		R[j] = arr[m + 1 + j];

	/* Merge the temp arrays back into arr[l..r]*/
	i = 0; // Initial index of first subarray
	j = 0; // Initial index of second subarray
	k = l; // Initial index of merged subarray
	while (i < n1 && j < n2) {
		if (L[i] <= R[j]) {
			arr[k] = L[i];
			i++;
		}
		else {
			arr[k] = R[j];
			j++;
		}
		k++;
	}

	/* Copy the remaining elements of L[], if there
	are any */
	while (i < n1) {
		arr[k] = L[i];
		i++;
		k++;
	}

	/* Copy the remaining elements of R[], if there
	are any */
	while (j < n2) {
		arr[k] = R[j];
		j++;
		k++;
	}
}

/* l is for left index and r is right index of the
sub-array of arr to be sorted */
void mergeSort(int arr[], int l, int r)
{
	if (l < r) {
		// Same as (l+r)/2, but avoids overflow for
		// large l and h
		int m = l + (r - l) / 2;

		// Sort first and second halves
		mergeSort(arr, l, m);
		mergeSort(arr, m + 1, r);

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

void printArray(int A[], int n)
{
	int i;
	for (i = 0; i < n; i++)
		out<<A[i]<<" ";
}


int main()
{
	int arr[500001];
	int n;
   in>>n;
   for (int i = 0; i < n; i++)
   {
      in>>arr[i];
   }
   mergeSort(arr, 0, n - 1);

	printArray(arr, n);
	return 0;
}