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Cod sursa(job #762977)
/*
Algoritm de sortare prin comparare - QuickSort.
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAX 500000
int numere[MAX];
void interschimb (int *a, int *b) {
int aux;
aux = *a;
*a = *b;
*b = aux;
}
void quicksort (int start, int stop) {
if (start >= stop)
return;
int i = start - 1;
int j = stop;
interschimb(&numere[start + rand() % (stop - start)], &numere[stop]);
int temp = numere[stop];
while (i < j) {
while (i < j && numere[++i] < temp)
;
while (i < j && numere[--j] > temp)
;
interschimb(&numere[i], &numere[j]);
}
interschimb(&numere[i], &numere[stop]);
quicksort(start, i - 1);
quicksort(i + 1, 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);
for (i = 0; i < n; i++)
printf("%d ", numere[i]);
return 0;
}