Problem
Given string S (length ≤ 8, lowercase, may contain duplicates), print all unique permutations in lexicographic order using recursion.
Input format
Input
input.txt
- A single string S
Output format
Output
output.txt
- Each unique permutation, one per line, sorted
Example
input
aab
output
aab aba baa
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Sample cases (from the problem)
Sample Case 1
Input
aab
Expected output
aab aba baa
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