I try to perfect your program.
It's really a hard work.
I got 2 CE and 4WA but finally I got AC.
Your problem have 2 errors.
The First One:
You should add this code after you read in N;


  if n=1 then begin writeln(0);halt(1);end;


So your program can give the right answer of the input
1 1
And then

You must use "<=" instead of "<" in line 9

Then your program can give the right answer of input
2 3



I use this way and got a AC.
Good luck next time .
And will you give me a hard work like this one????
:)

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Edited by moderator 24.11.2019 12:55