dsa16 min read
Next Permutation [Medium] — The In-Place Algorithm That Trips Up Senior Engineers [Google, Facebook, Amazon]
Next Permutation is not just an array problem — it is a test of systematic algorithmic thinking under pressure. Learn why you scan from the right, why you swap with the smallest larger element, and why the suffix is reversed rather than sorted. Includes full visual dry runs, the 4 most common bugs, and Python + JavaScript solutions.
Read →