You are given a 0-indexed integer array nums and an integer k.
Return an integer that denotes the sum of elements in nums whose corresponding indices have exactly k set bits in their binary representation.
The set bits in an integer are the 1's present when it is written in binary.
21 is 10101, which has 3 set bits.\n
Example 1:
\n\n\nInput: nums = [5,10,1,5,2], k = 1\nOutput: 13\nExplanation: The binary representation of the indices are: \n0 = 0002\n1 = 0012\n2 = 0102\n3 = 0112\n4 = 1002 \nIndices 1, 2, and 4 have k = 1 set bits in their binary representation.\nHence, the answer is nums[1] + nums[2] + nums[4] = 13.\n\n
Example 2:
\n\n\nInput: nums = [4,3,2,1], k = 2\nOutput: 1\nExplanation: The binary representation of the indices are:\n0 = 002\n1 = 012\n2 = 102\n3 = 112\nOnly index 3 has k = 2 set bits in its binary representation.\nHence, the answer is nums[3] = 1.\n\n\n
\n
Constraints:
\n\n1 <= nums.length <= 10001 <= nums[i] <= 1050 <= k <= 10i in the range [0, n - 1], for each index i count the number of bits in its binary representation. If it is k, add nums[i] to the result."
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