# Harmless Rooks puzzle of the week

#1

Hello,

I was trying to solve “Harmless Rooks”:

I was wondering if someone is getting better scores than required?
Size 5 -> ok
Size 8 -> ok
Size 16 -> ok
Size 30 -> I got 176 on 165
Size 50 -> 504/484
Size 99 -> 2000/1911
Size99 -> 2109/2018
Size99 -> 2166/2076
Size1 -> ok

I`ve triple checked my logic and it looks ok.

#2

Hi, completely independently of your logic, have you triple checked your results (it’s easier to check a solution than to solve a case and should reveal the problem)? For instance, can you post here, or by PM to me if you prefer, your actual solution (rooks positions) for the Size 30 testcase?

#3

I have just printed out my result to look for errors and I have found some…
fate of a rookie
I was my mistake, which i am hoping to repair thank you for quick reply anyway

#4

I can not solve this puzzle
The algorithm I implemented does not fully work.
2 tests with the size of 99 cells failed, the remaining tests pass successfully
Somewhere my logic is broken

#5

Maybe I can help if you explain your current logic in PM (to avoid spoil).

#6

Same here, I keep missing the result from a few rooks with the 99 tests… Arf

#7

hello all,
My solution works but it is too sloooow. I do not see how to optimize this problem.
I do not want the solution but can you send me some wikipedia links about this type of optimization.
Thanks