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Leetcode 3007. Maximum Number That Sum of the Prices Is Less Than or Equal to K
Given k and x, define price(num) as the count of 1-bits in num at bit positions x, 2x, 3x, ... (LSB = position 1); the accumulated price up to N is the sum of price(i) for i=1..N. Return the largest N whose accumulated price ≤ k — the core challenge is efficiently computing these cumulative bit counts for large k (≤1e15) by exploiting the periodicity of bit patterns (x ≤ 8).
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