very clear clear solution for Can Balance by rafal.pawlowski - python coding challenges

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very clear solution in Clear category for Can Balance by rafal.pawlowski

from typing import Iterable

def can_balance(weights: Iterable) -> int:
    for i in range(len(weights)):
        left = weights[:i][::-1]
        right = weights[i+1:]      
        if sum((nl + 1) * l for nl, l in enumerate(left)) == sum((nr + 1) * r for nr, r in enumerate(right)):
            return i
    else:
        return -1

April 10, 2019

Comments:

obone on Aug. 15, 2019, 8:50 a.m.
Looking clear enough. Do you need else block? Also line 7 may be improved. It’s too long. You can break it or use lambda sub-function: ... getweight = lambda items: sum((n + 1) * i for n, i in enumerate(items)) … if getweight(left) == get_weight(right): ...

rafal.pawlowski on Aug. 15, 2019, 10:01 p.m.
Thanks, else is not needed. I used it to show 'for else' loop. Lambda function would be a right improvement.

piter239 on April 23, 2020, 4:38 p.m.
very clear indeed, but O(n^2) instead of O(n)

rafal.pawlowski on April 23, 2020, 8:10 p.m.
speed category is in next tab...

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