Mbpp/453

import math
def sumofFactors(n: int) -> int:
    """
    Returns the sum of even factors of a positive integer n.
    """
    if n % 2 != 0:
        return 0  # odd numbers have no even factors
    
    m = n // 2
    divisor_sum = 0
    # Find all divisors of m
    for i in range(1, int(math.isqrt(m)) + 1):
        if m % i == 0:
            divisor_sum += i
            if i != m // i:
                divisor_sum += m // i
    # Each divisor of m corresponds to an even divisor 2 * divisor of n
    return 2 * divisor_sum

• 无失败测试

• 无失败测试