Grokking the Coding Interview: Patterns for Coding Questions

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String Permutations by changing case (medium)

Problem Statement

Given a string, find all of its permutations preserving the character sequence but changing case.

Example 1:

Input: "ad52"
Output: "ad52", "Ad52", "aD52", "AD52"

Example 2:

Input: "ab7c"
Output: "ab7c", "Ab7c", "aB7c", "AB7c", "ab7C", "Ab7C", "aB7C", "AB7C"

Constraints:

1 <= str.length <= 12
str consists of lowercase English letters, uppercase English letters, and digits.

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