Print all permutations of a string keeping the sequence but changing cases.
Input : ab Output : AB Ab ab aB Input : ABC Output : abc Abc aBc ABc abC AbC aBC ABC
Method 1 (Naive) : Naive approach would be to traverse the whole string and for every character, consider two cases, (1) change case and recur (2) Do not change case and recur.
Method 2 (Better) For a string of length n there exists 2n maximum combinations. We can represent this as a bitwise operation.
The same idea is discussed in Print all subsequences.
Below is the implementation of above idea :
abc Abc aBc ABc abC AbC aBC ABC
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