LeetCode/go/append-characters-to-string-to-make-subsequence.go

package main

func appendCharacters(s string, t string) int {
	si, ti := 0, 0

	for si < len(s) && ti < len(t) {
		if s[si] == t[ti] {
			ti++
		}
		si++
	}

	return len(t) - ti
}