mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
190 lines
16 KiB
JSON
190 lines
16 KiB
JSON
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"title": "Add Digits",
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"content": "<p>Given an integer <code>num</code>, repeatedly add all its digits until the result has only one digit, and return it.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = 38\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> The process is\n38 --> 3 + 8 --> 11\n11 --> 1 + 1 --> 2 \nSince 2 has only one digit, return it.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = 0\n<strong>Output:</strong> 0\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 <= num <= 2<sup>31</sup> - 1</code></li>\n</ul>\n\n<p> </p>\n<p><strong>Follow up:</strong> Could you do it without any loop/recursion in <code>O(1)</code> runtime?</p>\n",
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"code": "-spec add_digits(Num :: integer()) -> integer().\nadd_digits(Num) ->\n .",
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"A naive implementation of the above process is trivial. Could you come up with other methods?",
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"What are all the possible results?",
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"How do they occur, periodically or randomly?",
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"You may find this <a href=\"https://en.wikipedia.org/wiki/Digital_root\" target=\"_blank\">Wikipedia article</a> useful."
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],
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