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Cod sursa(job #762964)
/*
Algoritm de sortare prin comparare - QuickSort.
*/
#include <stdio.h>
#include <stdlib.h>
#define MAX 500000
int numere[MAX];
/*void quicksort (int start, int stop) {
int i = start - 1;
int j = stop;
int temp = numere[(i + j) >> 1];
do {
while (numere[i] < temp)
i++;
while (numere[j] > temp)
j--;
if (i <= j) {
int aux = numere[i];
numere[i] = numere[j];
numere[j] = aux;
i++;
j--;
}
} while (i <= j);
if (start < j)
quicksort(start, j);
if (i < stop)
quicksort(i, stop);
} */
void merge (int start, int stop) {
int i, j, k;
int aux[MAX];
int mid = (start + stop) >> 1;
for (i = start, j = mid + 1, k = start; i <= mid || j <= stop;)
if (j > stop || (i <= mid && numere[i] < numere[j]))
aux[k++] = numere[i++];
else
aux[k++] = numere[j++];
for (k = start; k <= stop; k++)
numere[k] = aux[k];
}
void mergesort (int start, int stop) {
if (start == stop)
return;
int mid = (start + stop) >> 1;
mergesort(start, mid);
mergesort(mid + 1, stop);
merge(start, stop);
}
int main () {
int n;
int i;
freopen("algsort.in", "r", stdin);
freopen("algsort.out", "w", stdout);
scanf("%d", &n);
for (i = 0; i < n; i++)
scanf("%d", &numere[i]);
//quicksort(0, n - 1);
mergesort(0, n - 1);
for (i = 0; i < n; i++)
printf("%d ", numere[i]);
return 0;
}