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Grokking the Coding Interview Patterns

Solution: Append Characters to String to Make Subsequence

Understand how to apply the two pointers technique to determine the minimum characters to append to a source string so that a target becomes its subsequence. Learn to efficiently track matched characters and optimize string manipulation for coding interviews.

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Statement

You’re given two strings, source and target, made up of lowercase English letters. Your task is to determine the minimum number of characters that must be appended to the end of the source so that the target becomes a subsequence of the resulting string.

Note: A subsequence is formed by deleting zero or more characters from a string without changing the order of the remaining characters.

Constraints:

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