Given the strings s1 and s2 of size n and the string evil, return the number of good strings.
A good string has size n, it is alphabetically greater than or equal to s1, it is alphabetically smaller than or equal to s2, and it does not contain the string evil as a substring. Since the answer can be a huge number, return this modulo 109 + 7.
\n
Example 1:
\n\n\nInput: n = 2, s1 = "aa", s2 = "da", evil = "b"\nOutput: 51 \nExplanation: 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\n\n
Example 2:
\n\n\nInput: n = 8, s1 = "leetcode", s2 = "leetgoes", evil = "leet"\nOutput: 0 \nExplanation: 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\n\n
Example 3:
\n\n\nInput: n = 2, s1 = "gx", s2 = "gz", evil = "x"\nOutput: 2\n\n\n
\n
Constraints:
\n\ns1.length == ns2.length == ns1 <= s21 <= n <= 5001 <= evil.length <= 50给你两个长度为 n 的字符串 s1 和 s2 ，以及一个字符串 evil 。请你返回 好字符串 的数目。
好字符串 的定义为：它的长度为 n ，字典序大于等于 s1 ，字典序小于等于 s2 ，且不包含 evil 为子字符串。
由于答案可能很大，请你返回答案对 10^9 + 7 取余的结果。
\n\n\n\n
示例 1：
\n\n输入：n = 2, s1 = "aa", s2 = "da", evil = "b"\n输出：51 \n解释：总共有 25 个以 'a' 开头的好字符串："aa"，"ac"，"ad"，...，"az"。还有 25 个以 'c' 开头的好字符串："ca"，"cc"，"cd"，...，"cz"。最后，还有一个以 'd' 开头的好字符串："da"。\n\n\n
示例 2：
\n\n输入：n = 8, s1 = "leetcode", s2 = "leetgoes", evil = "leet"\n输出：0 \n解释：所有字典序大于等于 s1 且小于等于 s2 的字符串都以 evil 字符串 "leet" 开头。所以没有好字符串。\n\n\n
示例 3：
\n\n输入：n = 2, s1 = "gx", s2 = "gz", evil = "x"\n输出：2\n\n\n
\n\n
提示：
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"book": null,
"isSubscribed": false,
"isDailyQuestion": false,
"dailyRecordStatus": null,
"editorType": "CKEDITOR",
"ugcQuestionId": null,
"style": "LEETCODE",
"exampleTestcases": "2\n\"aa\"\n\"da\"\n\"b\"\n8\n\"leetcode\"\n\"leetgoes\"\n\"leet\"\n2\n\"gx\"\n\"gz\"\n\"x\"",
"__typename": "QuestionNode"
}
}
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