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Grokking the Coding Interview Patterns in C++

Solution: Append Characters to String to Make Subsequence

Understand how to use the greedy two pointers technique to determine the least number of characters needed to append to a source string so that a target string becomes its subsequence. This lesson guides you through the algorithm and its time and space complexity for efficient string manipulation.

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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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