Deques (pronounced: "deck") (a.k.a. double-sided queues) are a data structure that allows for INSERTION and REMOVAL at both ends of a list. Essentially, it is a stack and queue in one! The deque is ...

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// dp[k][i] = max{dp[k][i-1], dp[k-1][i-d] + presum[i]-presum[i-d]} l<=d<=r; ...