Append Characters to String to Make Subsequence

Input: s = "coaching", t = "coding"

Output: 4

Append the characters "ding" to the end of s so that s = "coachingding". Now, t is a subsequence of s ("coachingding"). It can be shown that appending any 3 characters to the end of s will never make t a subsequence.

Input: s = "abcde", t = "a"

Output: 0

t is already a subsequence of s ("abcde").

Input: s = "z", t = "abcde"

Output: 5

Append the characters "abcde" to the end of s so that s = "zabcde". Now, t is a subsequence of s ("zabcde"). It can be shown that appending any 4 characters to the end of s will never make t a subsequence.

Append Characters to String to Make Subsequence

Problem

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Examples