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Leetcode 2172. Maximum AND Sum of Array
Place each number into one of numSlots (each slot holds at most two numbers) to maximize the sum of (number AND slotIndex). With numSlots ≤ 9 and n ≤ 2*numSlots, the core challenge is a combinatorial assignment optimized via bitmask/DP (or base-3 slot-occupancy DP).
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