Здравствуйте, needle, Вы писали:

N>#include <stdio.h>

...
N>for (int i=0; i<5000; i++) {
N>if (i==0) first=new cs;
N>else { a = new cs; a->next = first; first = a; }
...
for (int i=0; i<5000; i++) {
if (i==0){first=new cs; first->next = NULL; }
else { a = new cs; a->next = first; first = a; }