Yes looks good now.

@dfhwze, I've clarified this in the description. I hope it's easier to understand now

I think kyu 5 is fine. The hard part is figuring out the hidden specs.

• a person next to you can also be in front or behind you
• a moshpit is any connected area of open space that contains at least 1 2x2 open space square

cheeky :)

Amazing brevity

sick lambda

Description says it's supposed to be a pure function... This alters the input parameter.

The plural of "vertex" is "vertices"

"String out, brutha"

Thıs ıs a 7 kyu dıffıculty, not 8 kyu.

oop

Vector: so good, ya gotta include it twice! :)

The description is unclear

Read the oldest post below.

tri_bicolor_tiling(5, 2, 2, 2), Equals(18));

... yes - there are 18 ways

tri_bicolor_tiling(6, 2, 2, 2), Equals(54));

... no... there are 36 ways, not 54 ways.

either there's an error in the math or in the description