#include <stdio.h>
#include <stdlib.h>

void qsort_book(int v[], int left, int right);

/* sorts command line arguments */
int main(int argc, char *argv[])
{
    int i, v[argc-1];
    for (i = 1; i < argc; i++)
        v[i-1] = atoi(argv[i]);
    qsort_book(v, 0, argc-2);
    for (i = 0; i < argc-1; i++)
        printf("%d ", v[i]);
    putchar('\n');
    return 0;
}

/* swap: swap v[i] and v[j] */
void swap(int *v, int i, int j)
{
    int temp = v[i];
    v[i] = v[j], v[j] = temp;
}

/* qsort: sort v[left]...v[right] into increasing order */
void qsort_book(int v[], int left, int right)
{
    int i, last;

    if (left >= right) /* do nothing if array contains */
        return;        /* fewer than two elements */
    swap(v, left, (left + right)/2); /* move partition elem */
    last = left; /* to v[0] */

    for (i = left+1; i <= right; i++) /* partition */
        if (v[i] < v[left])
            swap(v, ++last, i);
    swap(v, left, last); /* restore partition elem */

    qsort_book(v, left, last-1);
    qsort_book(v, last+1, right);
}