How does backtracking generate permutations in LeetCode 46?

It swaps elements from the current start position with all later ones, recurses, then undoes—building every combo exhaustively.

What's the time and space complexity for LeetCode 46 permutations?

O(n! × n) time for generation and copying; O(n) space via recursion stack.

Best way to visualize LeetCode 46 backtracking?

Use TraceLit—steps through swaps line-by-line, no guesswork.

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LeetCode 46 Permutations: Backtracking's Brutal Efficiency Exposed

A cursor blinks accusingly on your laptop during a midnight grind. LeetCode 46 permutations demands recursion mastery—backtracking swaps deliver all combos without extra space.

theAIcatchup Apr 09, 2026 3 min read

Visual step-by-step trace of backtracking swaps for LeetCode 46 permutations on array [1,2,3]

⚡ Key Takeaways

Backtracking with in-place swaps generates all n! permutations efficiently for LeetCode 46. 𝕏
Visual tracers like TraceLit cut debugging time dramatically for recursion-heavy problems. 𝕏
Mastery signals strong recursion skills prized in Big Tech interviews amid tight hiring markets. 𝕏

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#algorithm visualization #backtracking #leetcode-46 #permutations #permutations algorithm #recursion

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Originally reported by Dev.to

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