Leetcode 869. Reordered Power of 2 | Permutation & Set Lookup | Python Solution

⚡ Solve Leetcode 869 – Reordered Power of 2 using string permutation logic and set lookup in Python! This problem checks if a given integer’s digits can be rearranged to form a power of two. Problem Summary: We precompute all powers of two up to 2^30 (since 10^9 fits in 32-bit int), store their digit-sorted strings in a set, and check if the input number’s sorted digits exist in that set. What You’ll Learn: Why sorting digits is enough to check permutations. Precomputing powers of two for fast lookup. Using set for O(1) average membership test. Clean and simple Python code. Dry run with examples for better understanding. 🔎 SEO Keywords (120) Leetcode 869, reordered power of 2, permutation check python, leetcode permutation problem, powers of two python, sorted digits trick, python set lookup, check if number can be reordered, leetcode math problem, python string sorting, permutation and power of two, python interview prep, leetcode python solution, python coding interview, sorted digits leetcode, python clean code, reordered power of 2 dry run, leetcode math and string, set membership python, precompute powers of two python, leetcode easy-medium, permutation trick python, python powers of two check, leetcode python explanation, python number permutations, sorted string leetcode, python set trick, python problem solving, leetcode set lookup, python optimized solution, reorder digits check, permutation lookup python, python time complexity, leetcode number rearrangement, python beginner leetcode, python interview ready, python powers problem, python coding statlearn tech, python logic interview, python permutation and powers, python set vs list lookup, powers precomputation python, leetcode 2025 python, python bit manipulation alternative, leetcode python short code, python integer to string, python string operations, python optimal code, python algorithm problem, leetcode faang python, python dry run example, reordered power of two example, python sorting integers, python sorted str, python string permutation check, python best approach, python for coding interviews, python clean explanation, python leetcode optimal solution, python number logic, python for beginners leetcode, leetcode full code python, python powers up to 2^30, python digit frequency check, python set precompute, leetcode easy python, python complexity analysis, python step-by-step solution, python number rearrange, python digits match, leetcode sorted digits, python matching numbers, python math and string problem, python digit reorder check 🏷️ Tags (within 500 characters) leetcode 869, reordered power of 2, python permutation check, sorted digits trick, python set lookup, leetcode math problem, python clean code, statlearn tech, python string sorting, precompute powers python, python leetcode solution, python interview prep, python problem solving, leetcode easy-medium, python dry run, python code walkthrough, permutation lookup python, reordered digits leetcode, python optimal code