Cod sursa(job #2451695)

Utilizator davidcotigacotiga david davidcotiga Data 27 august 2019 19:46:31
Problema Sortare prin comparare Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.04 kb
#include <fstream>
#include <iostream>

using namespace std;

ifstream fin("algsort.in");
ofstream fout("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;

	int L[25000], R[25000];

	
	for (i = 0; i < n1; i++)
		L[i] = arr[l + i];
	for (j = 0; j < n2; j++)
		R[j] = arr[m + 1 + j];

	
	i = 0; 
	j = 0;  
	k = l; 
	while (i < n1 && j < n2)
	{
		if (L[i] <= R[j])
		{
			arr[k] = L[i];
			i++;
		}
		else
		{
			arr[k] = R[j];
			j++;
		}
		k++;
	}


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

	
	while (j < n2)
	{
		arr[k] = R[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[50000];
	cin >> n;
	for (int i = 0; i < n; ++i)
		fin >> v[i];

	mergeSort(v, 0, n - 1);
	for (int i = 0; i < n; ++i)
		fout << v[i] << " ";

	return 0;
}