How to Solve Sum of Values at Indices With K Set Bits Problem
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Sum of Values at Indices With K Set Bits
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 representa...
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Understanding the Sum of Values at Indices With K Set Bits Problem
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Problem Statement
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. For example, the binary representation of 21 is 10101, which has 3 set bits.
Sum of Values at Indices With K Set Bits
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Examples
nums = [5,10,1,5,2], k = 113The binary representation of the indices are: 0 = 0002 1 = 0012 2 = 0102 3 = 0112 4 = 1002 Indices 1, 2, and 4 have k = 1 set bits in their binary representation. Hence, the answer is nums[1] + nums[2] + nums[4] = 13.
nums = [4,3,2,1], k = 21The binary representation of the indices are: 0 = 002 1 = 012 2 = 102 3 = 112 Only index 3 has k = 2 set bits in its binary representation. Hence, the answer is nums[3] = 1.
Constraints
1 <= nums.length <= 10001 <= nums[i] <= 1050 <= k <= 10How Interview Coder Helps with Leetcode Problems
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