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Partition the array into contiguous subarrays to maximize the sum of each segment's alternating-signed sum (cost(l,r) = nums[l] - nums[l+1] + ...). The challenge is deciding partition boundaries (i.e., which elements get plus or minus signs within segments) to maximize the total, with n up to 1e5.
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Leetcode 3196. Maximize Total Cost of Alternating Subarrays
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