Initial reaction is its more of a word problem then a coding problem.

That's how I found it to be too.

someone please tell me why test fail?
Time: 382ms Passed: 10 Failed: 100
should work for basic tests (5 Passed, 0 Failed)
should work for more fixed tests as well (5 Passed, 0 Failed)
should finally work for random tests
✘ Expected: 72, instead got: 61
✘ Expected: 90, instead got: 34
✘ Expected: 150, instead got: 94
✘ Expected: 79, instead got: 17
✘ Expected: 31, instead got: 8
✘ Expected: 96, instead got: 45
✘ Expected: 72, instead got: 53
✘ Expected: 157, instead got: 110
✘ ...

That's what I see too. I did something like var newArray = array.splice() so that the orginal array would not be mutated, and then did similar techniques on newArray.

"Hint: Do not modify the original array."
What? Array is an object and copying it to the new array just copy the link, so sorting a new array is modify original array. So what was meant in that hint?

To pass the tests, zero has to be considered a positive integer. Seems wrong

haha