quicksort compactado em c

quick.c

#include <stdio.h>
#include <stdlib.h> //rand srand
#include <time.h>//time
#define SWAP(x, y) do { typeof(x) SWAP = x; x = y; y = SWAP; } while (0) //gcc only

void quick(int * vet, int C, int F){
    if(C >= F) return;
    int i = C, j = F, pivo = vet[(i + j)/2];  
    while(i <= j){
        while (vet[i] < pivo) i++;
        while (vet[j] > pivo) j--;
        if(i <= j) {SWAP(vet[i], vet[j]); i++; j--;}
    }
    quick(vet, C, j); 
    quick(vet, i, F);   
}

void show(int * vet, int size){
    printf("[ ");
    for(int i = 0; i < size; i++)
        printf("%d ", vet[i]);
    printf("]\n");
}

int main(){
    srand(time(NULL));
    int vet[30];
    int size = sizeof(vet)/sizeof(int);
    for(int i = 0; i < size; i++)
        vet[i] = rand() % 90 + 10; //gerar números de 2 dígitos
    
    show(vet, size);
    quick(vet, 0, size - 1);
    show(vet, size);
    return 0;
}