How should I practice Isomorphic Strings?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Google onsite interview problems in FastPrep.

Is Isomorphic Strings associated with Google?

FastPrep tags this as a Google onsite interview coding practice problem when the problem catalog has that company and stage context.

Isomorphic Strings

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Problem statement

Given two strings first and second, return true when characters of first can be replaced to obtain second.

Every occurrence of one source character must map to the same target character, and two different source characters may not map to the same target character. Character order is preserved.

Function

areIsomorphic(first: String, second: String) → boolean

Examples

Example 1

first = "egg"second = "add"return = true

e maps to a and g maps to d.

Example 2

first = "foo"second = "bar"return = false

o would need to map to both a and r.

Example 3

first = "aaa"second = "XYZ"return = false

The same source character cannot map to three targets.

Constraints

0 <= first.length, second.length <= 200000.
Strings contain ASCII characters.