You are given a string s and an integer t, representing the number of transformations to perform. In one transformation, every character in s is replaced according to the following rules:
'z', replace it with the string "ab".'a' is replaced with 'b', 'b' is replaced with 'c', and so on.Return the length of the resulting string after exactly t transformations.
Since the answer may be very large, return it modulo 109 + 7.
\n
Example 1:
\n\nInput: s = "abcyy", t = 2
\n\nOutput: 7
\n\nExplanation:
\n\n'a' becomes 'b''b' becomes 'c''c' becomes 'd''y' becomes 'z''y' becomes 'z'"bcdzz"'b' becomes 'c''c' becomes 'd''d' becomes 'e''z' becomes "ab"'z' becomes "ab""cdeabab""cdeabab", which has 7 characters.Example 2:
\n\nInput: s = "azbk", t = 1
\n\nOutput: 5
\n\nExplanation:
\n\n'a' becomes 'b''z' becomes "ab"'b' becomes 'c''k' becomes 'l'"babcl""babcl", which has 5 characters.\n
Constraints:
\n\n1 <= s.length <= 105s consists only of lowercase English letters.1 <= t <= 105给你一个字符串 s 和一个整数 t，表示要执行的 转换 次数。每次 转换 需要根据以下规则替换字符串 s 中的每个字符：
'z'，则将其替换为字符串 \"ab\"。'a' 替换为 'b'，'b' 替换为 'c'，依此类推。返回 恰好 执行 t 次转换后得到的字符串的 长度。
由于答案可能非常大，返回其对 109 + 7 取余的结果。
\n\n
示例 1：
\n\n输入： s = \"abcyy\", t = 2
\n\n输出： 7
\n\n解释：
\n\n'a' 变为 'b''b' 变为 'c''c' 变为 'd''y' 变为 'z''y' 变为 'z'\"bcdzz\"'b' 变为 'c''c' 变为 'd''d' 变为 'e''z' 变为 \"ab\"'z' 变为 \"ab\"\"cdeabab\"\"cdeabab\"，长度为 7 个字符。示例 2：
\n\n输入： s = \"azbk\", t = 1
\n\n输出： 5
\n\n解释：
\n\n'a' 变为 'b''z' 变为 \"ab\"'b' 变为 'c''k' 变为 'l'\"babcl\"\"babcl\"，长度为 5 个字符。\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 \\u5df2\\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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"style": "LEETCODE",
"exampleTestcases": "\"abcyy\"\n2\n\"azbk\"\n1",
"__typename": "QuestionNode"
}
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