Leetcode 3644. Maximum K to Sort a Permutation

Find the largest non-negative integer k such that the permutation nums can be sorted by swapping only pairs of elements whose bitwise AND equals k. Equivalently, determine the maximum k for which the graph with vertices as positions (or values) and edges between entries with nums[i] & nums[j] == k has connected components that each contain the target values needed to place every element in sorted order.