Cod sursa(job #854050)

Utilizator razvan9310FMI - Razvan Damachi razvan9310 Data 12 ianuarie 2013 18:18:18
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.91 kb
#include <cstdio>
#include <cstdlib>
using namespace std;

int V[500000];

void merge(int *A, int startA, int stopA, int *B, int startB, int stopB)
{
	int i=startA, j=startB, k=0;
	int *C=(int*)malloc(4*(stopA-startA+stopB-startB+2));
	
	while (i<=stopA && j<=stopB)
		if (A[i] < B[j])
			C[k++] = A[i++];
		else C[k++] = B[j++];
	
	while (i <= stopA)
		C[k++] = A[i++];
	while (j <= stopB)
		C[k++] = B[j++];
	
	for (i=startA; i<startA+k; ++i)
		A[i] = C[i-startA];
	free(C);
}

void mergeSort(int *V, int inc, int sf)
{
	if (inc == sf) return;
	int m = (inc+sf)>>1;
	mergeSort(V, inc, m);
	mergeSort(V, m+1, sf);
	merge(V, inc, m, V, m+1, sf);
}

int main()
{
	freopen("algsort.in", "r", stdin);
	freopen("algsort.out", "w", stdout);
	int n, i;
	scanf("%d", &n);
	for (i=0; i<n; ++i)
		scanf("%d", &V[i]);
	
	mergeSort(V, 0, n-1);
	
	for (i=0; i<n; ++i)
		printf("%d ", V[i]);
}