Given two strings s and t, determine if they are isomorphic.
Two strings s and t are isomorphic if the characters in s can be replaced to get t.
All occurrences of a character must be replaced with another character while preserving the order of characters. No two characters may map to the same character, but a character may map to itself.
Example 1:
Input: s = "egg", t = "add"
Output: true
Explanation:
The strings s and t can be made identical by:
'e' to 'a'.'g' to 'd'.Example 2:
Input: s = "f11", t = "b23"
Output: false
Explanation:
The strings s and t can not be made identical as '1' needs to be mapped to both '2' and '3'.
Example 3:
Input: s = "paper", t = "title"
Output: true
Constraints:
1 <= s.length <= 5 * 104t.length == s.lengths and t consist of any valid ascii character.