In this Kata, you will sort elements in an array by decreasing frequency of elements. If two elements have the same frequency, sort them by increasing value. 
More examples in test cases. 
Good luck!
Please also try [Simple time difference](https://www.codewars.com/kata/5b76a34ff71e5de9db0000f2)
def solve(arr):
    freq = {n: -arr.count(n) for n in set(arr)}
    return sorted(sorted(arr), key=freq.get)
def solve(arr):
    freq = {n: -arr.count(n) for n in set(arr)}
    return sorted(sorted(arr), key=freq.get)