Unlike subsets, order matters. You need to consider ALL elements at each position, not just those after a start index. Use a visited array (or set) to track which elements are already in the current permutation. At each step, try adding any unvisited element. When the permutation is complete (length equals n), add it to results.
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
$ curl repovive.com/roadmaps/maang-interview-prep/backtracking/permutations-hint
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