nope, there is another last test and your solution is failing on this one (it's the hardest test of the test suite).

(EDIT: actually, don't think about optimizing further, considering your other timings. You'd rather need to explore the situation to understand why your code cannot handle this special test)

wrong:

• your suggestion will time out
• what is hard is to pick numbers that are covering different situations ("binary speaking").

meaning the tests are shit in JS... :/