#include <stdio.h>
#include <string.h>

#define MAXLINES 5000       /* max #lines to be sorted */

char *lineptr[MAXLINES];    /* pointers to text lines */

int readlines(char *lineptr[], int nlines);
void writelines(char *lineptr[], int nlines);

void qsort(char *lineptr[], int left, int right);

/* sort input lines */
main()
{
	int nlines;    /* number of input lines read */

	if ((nlines = readlines(lineptr, MAXLINES)) >= 0) {
		qsort(lineptr, 0, nlines-1);
		writelines(lineptr, nlines);
		return 0;
	} else {
		printf("error: input too big to sort\n");
		return 1;
	}
}