Isomorphic Strings:Given two strings s and t, determine if they are isomorphic.
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"
Example 2:Input: s = "foo", t = "bar"
Example 3:Input: s = "paper", t = "title"
Constraints:1 <= s.length <= 5 * 104
t.length == s.length
s and t consist of any valid ascii character.
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