Through Permutations, you test your understanding of when order matters. The visited array pattern is different from the start index pattern in Subsets. Google, Meta, and Amazon ask this frequently. It's a natural follow-up after Subsets. The difference: Subsets uses start index (order doesn't matter). Permutations uses visited array (order matters).
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$ curl repovive.com/roadmaps/maang-interview-prep/backtracking/permutations-why-this-problem
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