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First solution in Clear category for Can Balance by brownie57
from typing import Iterable
def can_balance(weights: Iterable) -> int:
for i in range(0, len(weights)):
left = sum([n * x for n, x in enumerate(weights[i::-1])])
right = sum([n * x for n, x in enumerate(weights[i:])])
if left == right:
return i
return -1
if __name__ == '__main__':
print("Example:")
print(can_balance([6, 1, 10, 5, 4]))
# These "asserts" are used for self-checking and not for an auto-testing
assert can_balance([6, 1, 10, 5, 4]) == 2
assert can_balance([10, 3, 3, 2, 1]) == 1
assert can_balance([7, 3, 4, 2, 9, 7, 4]) == -1
assert can_balance([42]) == 0
print("Coding complete? Click 'Check' to earn cool rewards!")
Jan. 8, 2019
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