How to Solve Check if an Original String Exists Given Two Encoded Strings Problem
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Check if an Original String Exists Given Two Encoded Strings
An original string, consisting of lowercase English letters, can be encoded by the following steps: Arbitrarily split it into a sequence of some number of non-empty substrings. Arbitrarily choose some...
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Understanding the Check if an Original String Exists Given Two Encoded Strings Problem
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Problem Statement
An original string, consisting of lowercase English letters, can be encoded by the following steps: Arbitrarily split it into a sequence of some number of non-empty substrings. Arbitrarily choose some elements (possibly none) of the sequence, and replace each with its length (as a numeric string). Concatenate the sequence as the encoded string. For example, one way to encode an original string "abcdefghijklmnop" might be: Split it as a sequence: ["ab", "cdefghijklmn", "o", "p"]. Choose the second and third elements to be replaced by their lengths, respectively. The sequence becomes ["ab", "12", "1", "p"]. Concatenate the elements of the sequence to get the encoded string: "ab121p". Given two encoded strings s1 and s2, consisting of lowercase English letters and digits 1-9 (inclusive), return true if there exists an original string that could be encoded as both s1 and s2. Otherwise, return false. Note: The test cases are generated such that the number of consecutive digits in s1 and s2 does not exceed 3.
Check if an Original String Exists Given Two Encoded Strings
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Examples
s1 = "internationalization", s2 = "i18n"trueIt is possible that "internationalization" was the original string. - "internationalization" -> Split: ["internationalization"] -> Do not replace any element -> Concatenate: "internationalization", which is s1. - "internationalization" -> Split: ["i", "nternationalizatio", "n"] -> Replace: ["i", "18", "n"] -> Concatenate: "i18n", which is s2
s1 = "l123e", s2 = "44"trueIt is possible that "leetcode" was the original string. - "leetcode" -> Split: ["l", "e", "et", "cod", "e"] -> Replace: ["l", "1", "2", "3", "e"] -> Concatenate: "l123e", which is s1. - "leetcode" -> Split: ["leet", "code"] -> Replace: ["4", "4"] -> Concatenate: "44", which is s2.
s1 = "a5b", s2 = "c5b"falseIt is impossible. - The original string encoded as s1 must start with the lett
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