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Generate Wildcard Binary Strings

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Problem statement

pattern contains 0, 1, and ?. Replace every wildcard independently with either 0 or 1 and return every resulting binary string in lexicographic order.

Function

expandWildcards(pattern: String) → String[]

Examples

Example 1

pattern = "01?0"return = ["0100","0110"]

The one wildcard produces two strings.

Example 2

pattern = "0??0"return = ["0000","0010","0100","0110"]

Two wildcards produce four strings.

Constraints

0 <= pattern.length <= 20.