mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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182 lines
16 KiB
JSON
182 lines
16 KiB
JSON
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"title": "Largest 3-Same-Digit Number in String",
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"content": "<p>You are given a string <code>num</code> representing a large integer. An integer is <strong>good</strong> if it meets the following conditions:</p>\n\n<ul>\n\t<li>It is a <strong>substring</strong> of <code>num</code> with length <code>3</code>.</li>\n\t<li>It consists of only one unique digit.</li>\n</ul>\n\n<p>Return <em>the <strong>maximum good </strong>integer as a <strong>string</strong> or an empty string </em><code>""</code><em> if no such integer exists</em>.</p>\n\n<p>Note:</p>\n\n<ul>\n\t<li>A <strong>substring</strong> is a contiguous sequence of characters within a string.</li>\n\t<li>There may be <strong>leading zeroes</strong> in <code>num</code> or a good integer.</li>\n</ul>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = "6<strong><u>777</u></strong>133339"\n<strong>Output:</strong> "777"\n<strong>Explanation:</strong> There are two distinct good integers: "777" and "333".\n"777" is the largest, so we return "777".\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = "23<strong><u>000</u></strong>19"\n<strong>Output:</strong> "000"\n<strong>Explanation:</strong> "000" is the only good integer.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> num = "42352338"\n<strong>Output:</strong> ""\n<strong>Explanation:</strong> No substring of length 3 consists of only one unique digit. Therefore, there are no good integers.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>3 <= num.length <= 1000</code></li>\n\t<li><code>num</code> only consists of digits.</li>\n</ul>\n",
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"We can sequentially check if “999”, “888”, “777”, … , “000” exists in num in that order. The first to be found is the maximum good integer.",
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"If we cannot find any of the above integers, we return an empty string “”."
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