996. Number of Squareful Arrays

LeetCodeArrayHash TableMathDynamic ProgrammingBacktrackingBit ManipulationOpen on judge ↗

An array is squareful if the sum of every pair of adjacent elements is a perfect square. Given an integer array nums, return the number of permutations of nums that are squareful. Two permutations perm1 and perm2 are different if there is some index i such that perm1[i] != perm2[i]. Example 1: Input: nums = [1,17,8] Output: 2 Explanation: [1,8,17] and [17,8,1] are the valid permutations. Ex

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solution.cppC++17

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