You are given two strings word1 and word2.
A string x is called valid if x can be rearranged to have word2 as a prefix.
Return the total number of valid substrings of word1.
\n
Example 1:
\n\nInput: word1 = "bcca", word2 = "abc"
\n\nOutput: 1
\n\nExplanation:
\n\nThe only valid substring is "bcca" which can be rearranged to "abcc" having "abc" as a prefix.
Example 2:
\n\nInput: word1 = "abcabc", word2 = "abc"
\n\nOutput: 10
\n\nExplanation:
\n\nAll the substrings except substrings of size 1 and size 2 are valid.
\nExample 3:
\n\nInput: word1 = "abcabc", word2 = "aaabc"
\n\nOutput: 0
\n\n
Constraints:
\n\n1 <= word1.length <= 1051 <= word2.length <= 104word1 and word2 consist only of lowercase English letters.Compiled with clang 17 using the latest C++ 23 standard, and libstdc++ provided by GCC 13.
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