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推廣網站開發,包含 Laravel 和 Kotlin 後端撰寫、自動化測試、讀書心得等。Taiwan Kotlin User Group 管理員。

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Hi, here's your problem today. This problem was recently asked by Amazon:

Given a number like 159, add the digits repeatedly until you get a single number.

For instance, 1 + 5 + 9 = 15. 1 + 5 = 6.

So the answer is 6.

class Solution(object):
  # Fill this in.

print(Solution().addDigits(159))
# 1 + 5 + 9 = 15
# 1 + 5 = 6
# 6