There is no point to return a double with less precision.

In the example has solve("v") = True but not tested in Java Test Cases.

Also why The Wall blocks your way has no full stop but You do not have a ship to cross this sea.

Very similar to Don't Eat the Last Cake!
https://www.codewars.com/kata/dont-eat-the-last-cake

Nice Kata.

• Somewhere in description Storm is spelled wrongly as Strom.
• Need random tests. See https://github.com/Codewars/codewars.com/wiki/Codewars-JavaScript-Test-Framework#utilities
• You swapped the arguments in Test.assertEquals(actual, expected[, msg]).
• In Headlines format, a whitespace is required between # and the text.

Also, add a for-loop to test it maybe 1000 times at least.

I mean the 22 AminoAcids.

The pitfall of HashMap is about hash code collision and rehash right?
Such collision will cause extra LinkedList-style traversal.

I made a HashMap<Protein, Set<proteinId>>. Failed at test_4_500000. Any clue?

You're right

Thx for the reply

Test.assertSimilar(
calcLevel({js:0,ruby:0,java:0},['js 7kyu']), 
"Total level: 8kyu 1%, JS level: 8kyu 4%, Ruby level: 8kyu 0%, Java level: 8kyu 0%");

After solving the Kata, JS will be 5 points right? (level difference * 2 + 3 points)
So the percentage of JS will be 5 / 91 = 5.49%
But why the expected value is 4%?