timing out from backtrack :(

js plz

Its 5 per test.

How many assertions per test? In my 100 random tests I've got 255 assertions passed but still timing out.

because that's a code working only for python 2

This code doesn't seem to pass when I copy and paste it.
range(1, 6) should equal [1, 2, 3, 4, 5]

?

У меня без list(...) не получилось, но это круто что у тебя так получилось

lol why was this downvoted

woah that's just amazing. I never fail to learn new things even in 8 kyu katas

Very interest Kata :) Thank you
luckily i found the right method. my algorithm solved everything in 6 seconds, only on one Sudoku from your set it was required to take 1 step back.
also my algorithm solved in 2 seconds "the most difficult sudoku in the world" by taking 14 steps back. I'm glad that my program coped with it!

It depends what exactly you mean by "backtracking algorithm", but there's "hard" in the title for a reason.
My solution does not use backtracking at all.

why is backtracking alorithm not efficient enough?? wat isnt it supposed to be the solution here

ive never heard a good programmer say "so what" before