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Problem: Append Characters to String to Make Subsequence

Understand how to determine the fewest characters to append to one string to make another string its subsequence. Explore the two-pointer technique that efficiently matches characters while maintaining order in JavaScript.

Statement

You are given two strings s and t, both composed entirely of lowercase English letters.

A subsequence of a string is a sequence of characters obtained by deleting zero or more characters from the string without changing the relative order of the remaining characters.

Determine the minimum number of characters that must be appended to the end of s so that t becomes a subsequence of s.

Constraints:

  • 11 \leq s.length, t.length 105\leq 10^5 ...