CF1396A Multiples of Length

You are given an array $ a $ of $ n $ integers. You want to make all elements of $ a $ equal to zero by doing the following operation exactly three times: - Select a segment, for each number in this segment we can add a multiple of $ len $ to it, where $ len $ is the length of this segment (added integers can be different). It can be proven that it is always possible to make all elements of $ a $ equal to zero.

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