who can explain me, why there is a crash with division by zero? there is no division in my program! in the acmp the solution was accepted, but there...

maybe you are using "div" or "mod" functions .:)

1) Sometimes virtual pascal gives this, or other new pascals for Vista/7. Use Turbo Pascal with Dosbox and everything will be ok.
2) If problem is not as I described it in 1) then give us your WA code.