[해커랭크] Append and Delete https://www.hackerrank.com/challenges/append-and-delete/problem?isFullScreen=true Append and Delete | HackerRankCan you convert $s$ to $t$ by performing exactly $k$ operations?www.hackerrank.com You have two strings of lowercase English letters. You can perform two types of operations on the first string:Append a lowercase English letter to the end of the string.Delete t..