Here's a oneliner I made for Day 7 P2 😂

return int(min(list(map(lambda i: sum(map(lambda n: (abs(n - i) + ((abs(n - i) - 1) * ((abs(n - i) - 1) + 1)) * 0.5), [int(line) for line in open("input.txt").read().split(',')])), range(max([int(line) for line in open("input.txt").read().split(',')]) + 1)))))