Cod sursa(job #1487271)

Utilizator aimrdlAndrei mrdl aimrdl Data 16 septembrie 2015 16:49:00
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.83 kb
#include <stdio.h>
#include <iostream>

#define MAX 500005

using namespace std;

int N, v[MAX], aux[MAX];

void mergeSort (int l, int r) {
	if (l == r) return;
	
	int mid = (l + r) / 2;
	
	mergeSort(l, mid);
	mergeSort(mid+1, r);
	
	int i, j, p = l;
	for (i = l, j = mid + 1; i <= mid && j <= r;) {
		if (v[i] > v[j]) {
			aux[p] = v[j];
			++j;
		} else {
			aux[p] = v[i];
			++i;
		}
		++p;
	}
	
	while (i <= mid) {
		aux[p] = v[i];
		++p; ++i;
	}
	
	while (j <= r) {
		aux[p] = v[j];
		++p; ++j;
	}
	
	for (i = l; i <= r; ++i) {
		v[i] = aux[i];
	}
}

int main (void) { 
	freopen("algsort.in", "r", stdin);
	freopen("algsort.out", "w", stdout);
	
	ios_base::sync_with_stdio(false);
	
	cin >> N;
	
	for (int i = 0; i < N; ++i) {
		cin >> v[i];
	}
	
	mergeSort(0, N-1);
	
	for (int i = 0; i < N; ++i) {
		cout << v[i] << " ";
	}
	
	return 0;
}