mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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185 lines
16 KiB
JSON
185 lines
16 KiB
JSON
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"questionId": "1987",
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"title": "Substrings of Size Three with Distinct Characters",
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"content": "<p>A string is <strong>good</strong> if there are no repeated characters.</p>\n\n<p>Given a string <code>s</code>, return <em>the number of <strong>good substrings</strong> of length <strong>three </strong>in </em><code>s</code>.</p>\n\n<p>Note that if there are multiple occurrences of the same substring, every occurrence should be counted.</p>\n\n<p>A <strong>substring</strong> is a contiguous sequence of characters in a string.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "xyzzaz"\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> There are 4 substrings of size 3: "xyz", "yzz", "zza", and "zaz". \nThe only good substring of length 3 is "xyz".\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "aababcabc"\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> There are 7 substrings of size 3: "aab", "aba", "bab", "abc", "bca", "cab", and "abc".\nThe good substrings are "abc", "bca", "cab", and "abc".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 100</code></li>\n\t<li><code>s</code> consists of lowercase English letters.</li>\n</ul>\n",
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"code": "-spec count_good_substrings(S :: unicode:unicode_binary()) -> integer().\ncount_good_substrings(S) ->\n .",
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"Try using a set to find out the number of distinct characters in a substring."
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Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. 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