mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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180 lines
18 KiB
JSON
180 lines
18 KiB
JSON
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"question": {
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"questionId": "1513",
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"questionFrontendId": "1397",
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"boundTopicId": null,
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"title": "Find All Good Strings",
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"titleSlug": "find-all-good-strings",
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"content": "<p>Given the strings <code>s1</code> and <code>s2</code> of size <code>n</code> and the string <code>evil</code>, return <em>the number of <strong>good</strong> strings</em>.</p>\n\n<p>A <strong>good</strong> string has size <code>n</code>, it is alphabetically greater than or equal to <code>s1</code>, it is alphabetically smaller than or equal to <code>s2</code>, and it does not contain the string <code>evil</code> as a substring. Since the answer can be a huge number, return this <strong>modulo</strong> <code>10<sup>9</sup> + 7</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 2, s1 = "aa", s2 = "da", evil = "b"\n<strong>Output:</strong> 51 \n<strong>Explanation:</strong> There are 25 good strings starting with 'a': "aa","ac","ad",...,"az". Then there are 25 good strings starting with 'c': "ca","cc","cd",...,"cz" and finally there is one good string starting with 'd': "da". \n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 8, s1 = "leetcode", s2 = "leetgoes", evil = "leet"\n<strong>Output:</strong> 0 \n<strong>Explanation:</strong> All strings greater than or equal to s1 and smaller than or equal to s2 start with the prefix "leet", therefore, there is not any good string.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 2, s1 = "gx", s2 = "gz", evil = "x"\n<strong>Output:</strong> 2\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>s1.length == n</code></li>\n\t<li><code>s2.length == n</code></li>\n\t<li><code>s1 <= s2</code></li>\n\t<li><code>1 <= n <= 500</code></li>\n\t<li><code>1 <= evil.length <= 50</code></li>\n\t<li>All strings consist of lowercase English letters.</li>\n</ul>\n",
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"translatedTitle": null,
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"difficulty": "Hard",
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"exampleTestcases": "2\n\"aa\"\n\"da\"\n\"b\"\n8\n\"leetcode\"\n\"leetgoes\"\n\"leet\"\n2\n\"gx\"\n\"gz\"\n\"x\"",
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"categoryTitle": "Algorithms",
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"code": "class Solution(object):\n def findGoodStrings(self, n, s1, s2, evil):\n \"\"\"\n :type n: int\n :type s1: str\n :type s2: str\n :type evil: str\n :rtype: int\n \"\"\"\n ",
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"code": "class Solution {\n fun findGoodStrings(n: Int, s1: String, s2: String, evil: String): Int {\n \n }\n}",
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"code": "func findGoodStrings(n int, s1 string, s2 string, evil string) int {\n \n}",
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"lang": "Ruby",
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"code": "# @param {Integer} n\n# @param {String} s1\n# @param {String} s2\n# @param {String} evil\n# @return {Integer}\ndef find_good_strings(n, s1, s2, evil)\n \nend",
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"lang": "Scala",
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"langSlug": "scala",
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"code": "object Solution {\n def findGoodStrings(n: Int, s1: String, s2: String, evil: String): Int = {\n \n }\n}",
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"__typename": "CodeSnippetNode"
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},
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{
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"lang": "Rust",
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"langSlug": "rust",
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"code": "impl Solution {\n pub fn find_good_strings(n: i32, s1: String, s2: String, evil: String) -> i32 {\n \n }\n}",
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"code": "(define/contract (find-good-strings n s1 s2 evil)\n (-> exact-integer? string? string? string? exact-integer?)\n )",
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"lang": "Erlang",
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"langSlug": "erlang",
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"code": "-spec find_good_strings(N :: integer(), S1 :: unicode:unicode_binary(), S2 :: unicode:unicode_binary(), Evil :: unicode:unicode_binary()) -> integer().\nfind_good_strings(N, S1, S2, Evil) ->\n .",
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"lang": "Elixir",
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"code": "defmodule Solution do\n @spec find_good_strings(n :: integer, s1 :: String.t, s2 :: String.t, evil :: String.t) :: integer\n def find_good_strings(n, s1, s2, evil) do\n \n end\nend",
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"hints": [
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"Use DP with 4 states (pos: Int, posEvil: Int, equalToS1: Bool, equalToS2: Bool) which compute the number of valid strings of size \"pos\" where the maximum common suffix with string \"evil\" has size \"posEvil\". When \"equalToS1\" is \"true\", the current valid string is equal to \"S1\" otherwise it is greater. In a similar way when equalToS2 is \"true\" the current valid string is equal to \"S2\" otherwise it is smaller.",
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"To update the maximum common suffix with string \"evil\" use KMP preprocessing."
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],
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"sampleTestCase": "2\n\"aa\"\n\"da\"\n\"b\"",
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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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