Problem Statement: http://www.ardendertat.com/2011/10/28/programming-interview-questions-11-all-permutations-of-string/
Time complexity: O(N!)
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s e
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t s
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s t
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t e
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Time complexity: O(N!)
tes
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/ \
e s
/ /
s e
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t s
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s t
s
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t e
/ /
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