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原题： Chisa Yukizome works as a teacher in the school. She prepares many gifts, which consist of nn kinds with a[i]a[i] quantities of each kind, for her students and wants to hold a class meeti

原题： Mr. Panda lives in Pandaland. There are many cities in Pandaland. Each city can be treated as a point on a 2D plane. Different cities are located in different locations.  There are also M bi