Web Reference: It works recursively by setting the first element (iterating through all unique elements), and iterating through the permutations for all remaining elements. Let's go through the unique_permutations of (1,2,3,1) to see how it works: Jul 23, 2025 · Explanation: This function uses Heap’s algorithm, recursively reducing size to 1 to print permutations, swapping elements after each call based on size parity to generate all unique permutations. Nov 4, 2025 · How does one efficiently generate all unique permutations of a sequence that contains duplicate elements in Python? Several distinct strategies exist, leveraging built-in libraries, custom recursive logic, and even high-performance tools like numba.
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