Given a circular integer array nums of length n, return the maximum possible sum of a non-empty subarray of nums. A circular array means the end of the array connects to the beginning of the array.

- 需要记录在0 ~ i点(包括nums[i], 以nums[i]结尾)的sum, 坐标型动态规划. write a function to check if the array has a continuous subarray of size at least 2 that sums up to the multiple of k, that is, sums up to n*k where ...

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