for nerds only

python

• missing imports
• python new test framework
• no assertion messages

I feel dumb now

You may not a beginner anymore, but I think the complexity of this is O(n^2) where n is the len of the secret.

I use "triplets * 2" have passed.
but i don't know why use it.

letters is a list of all the different letters in the string, and the for loop is just repeatedly looking a the triplets
eg. if triplets=[[1,2],[3,4]] then letters is a list containing 1,2,3,4 in any order, and t will be [1,2] and [3,4], 4 times each

Rounding prevents correct float comparision.

Two similar values may be rouded to different results, e.g. 0.995, 0.9950000000000001 => 0.99, 1.0

Results are wrong.

Your points change direction after collision, 2nd sample test 40° -> 37.5°; 3rd sample test: 34° -> 28.5°

a=k*9.8 is acceleration in the direction of movement, but you use it as both a_x and a_y

This is the worst kata I ever seen.

How do you even come up with the solutions like this! Damn my mind sezies

Alex, for fuck sake, when will you get the idea that he cannot fix anything he doesn't know/understand in the first place. So just explain to him what you want exactly.

it can be inconvenient if the ans differs at 4th or 5th decimal place

And that's why you have to compare the values for approximate equality instead of coming up with bad requirements?

i'm sorry for being such a mess but its my first and i'm gaining a lot from your issues.

but that is the ans and i have asked to return ans rounded to second decimal place because it can be inconvenient if the ans differs at 4th or 5th decimal place.