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Grokking the Coding Interview Patterns in C++

Solution: Append Characters to String to Make Subsequence

Explore how to determine the minimum characters needed to append to make one string a subsequence of another. Learn to apply the two pointers technique efficiently to match characters in order and optimize your solution with linear time complexity and constant space usage.

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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:

  • 1≤1 \leq source.length, target.length ≤103\leq 10^3 ...