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Input  :: [10,20,25,0]

Output :: ["+0", "+10", "+15", "-10"] 

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Difficulty: introductory

Starter code:

def equalize(arr):
	

Solutions:
def equalize(arr):
    return ["{:+d}".format(i-arr[0]) for i in arr]

def equalize(arr):
    return [f"{n - arr[0]:+d}" for n in arr]

def equalize(arr):
    return [f"{e - arr[0]:+d}" for e in arr]

def equalize(arr):
    return [f"{nb - arr[0]:+d}" for nb in arr]

def equalize(arr):
    return ['{:+d}'.format(n - arr[0]) for n in arr]

def equalize(xs):
    return [f'{x-xs[0]:+d}' for x in xs]

from itertools import product

def equalize(xs):
    return ['{:+d}'.format(x - xs[0]) for x in xs]

def equalize(arr):
    return [format(x - arr[0], '+') for x in arr]

equalize=lambda A:['%+d'%(i-A[0]) for i in A]

def equalize(arr):
    return ["+" + str(x - arr[0]) if x >= arr[0] else "-" + str(arr[0] - x) for x in arr]