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Problem
Given string S (distinct lowercase letters, length ≤ 8) and integer K (1-based), print the Kth lexicographic permutation of S using recursion.
Input format
Input
input.txt
- S - K
Output format
Output
output.txt
- The Kth lexicographic permutation (or "NONE" if K is too large)
Example
input
abc 4
output
bac
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Sample cases (from the problem)
Sample Case 1
Input
abc 4
Expected output
bac
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