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+# 2897. Apply Operations on Array to Maximize Sum of Squares
+from collections import Counter
+
+"""
+you are given a 0-indexed integer array 'nums' and a positive integer 'k'.
+you can do the following operation on the array any number of times: choose
+any two distinct indices 'i' and 'j' and simultaneously update the values of
+'nums[i]' to '(nums[i] & nums[j])' and 'nums[j]' to '(nums[i] | nums[j])'.
+you have to choose 'k' elements from the final array and calcluate the sum of
+their squares. return the maximum sum of squares you can achieve. since the
+answer can be very large, return it modulo 10^9+7.
+"""
+
+
+class Solution(object):
+ def maxSum(self, nums, k):
+ """
+ :type nums: List[int]
+ :type k: int
+ :rtype: int
+ """
+ cnt = Counter(i for j in nums for i in range(32) if j & (1 << i))
+ return sum(sum((cnt[i] > j) << i for i in range(32)) ** 2 for j in range(k)) % (
+ 10**9 + 7
+ )
+
+
+if __name__ == "__main__":
+ obj = Solution()
+ print(obj.maxSum(nums=[2, 6, 5, 8], k=2))
+ print(obj.maxSum(nums=[4, 5, 4, 7], k=3))