You are given two strings s and t of the same length and an integer maxCost.
You want to change s to t. Changing the ith character of s to ith character of t costs |s[i] - t[i]| (i.e., the absolute difference between the ASCII values of the characters).
Return the maximum length of a substring of s that can be changed to be the same as the corresponding substring of t with a cost less than or equal to maxCost. If there is no substring from s that can be changed to its corresponding substring from t, return 0.
\n
Example 1:
\n\n\nInput: s = "abcd", t = "bcdf", maxCost = 3\nOutput: 3\nExplanation: "abc" of s can change to "bcd".\nThat costs 3, so the maximum length is 3.\n\n\n
Example 2:
\n\n\nInput: s = "abcd", t = "cdef", maxCost = 3\nOutput: 1\nExplanation: Each character in s costs 2 to change to character in t, so the maximum length is 1.\n\n\n
Example 3:
\n\n\nInput: s = "abcd", t = "acde", maxCost = 0\nOutput: 1\nExplanation: You cannot make any change, so the maximum length is 1.\n\n\n
\n
Constraints:
\n\n1 <= s.length <= 105t.length == s.length0 <= maxCost <= 106s and t consist of only lowercase English letters.给你两个长度相同的字符串，s 和 t。
将 s 中的第 i 个字符变到 t 中的第 i 个字符需要 |s[i] - t[i]| 的开销（开销可能为 0），也就是两个字符的 ASCII 码值的差的绝对值。
用于变更字符串的最大预算是 maxCost。在转化字符串时，总开销应当小于等于该预算，这也意味着字符串的转化可能是不完全的。
如果你可以将 s 的子字符串转化为它在 t 中对应的子字符串，则返回可以转化的最大长度。
如果 s 中没有子字符串可以转化成 t 中对应的子字符串，则返回 0。
\n\n
示例 1：
\n\n\n输入：s = \"abcd\", t = \"bcdf\", maxCost = 3\n输出：3\n解释：s 中的 \"abc\" 可以变为 \"bcd\"。开销为 3，所以最大长度为 3。\n\n
示例 2：
\n\n\n输入：s = \"abcd\", t = \"cdef\", maxCost = 3\n输出：1\n解释：s 中的任一字符要想变成 t 中对应的字符，其开销都是 2。因此，最大长度为 1。\n\n\n示例 3：
\n\n\n输入：s = \"abcd\", t = \"acde\", maxCost = 0\n输出：1\n解释：a -> a, cost = 0，字符串未发生变化，所以最大长度为 1。\n\n\n
\n\n
提示：
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collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5c06\\u57282020\\u5e74\\u540e\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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