Delta Encoding

Problem

Encode a list of integers as its first element followed by the differences between consecutive elements.

For example [4, 7, 9, 15] becomes [4, 3, 2, 6]. Return an empty list for empty input.

Hint

The first value is kept as the starting point for the differences.

case 1

in: [[4,7,9,15]]

expected: [4,3,2,6]

case 2

in: [[5]]

expected: [5]

case 3

in: [[]]

expected: []

case 4

in: [[-3,0,-3]]

expected: [-3,3,-3]

case 5

in: [[10,10,10]]

expected: [10,0,0]

Starter codePython

def delta_encode(nums):
    # Your code here
    pass

5 test cases · run your code against them in the editor