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CJMO 2020 Problem 2

    Ziquan makes a drawing in the plane for art class. He starts by placing his pen at the origin, and draws a series of line segments, such that the nthn^{th} line segment has length nn . He is not allowed to lift his pen, so that the end of the nthn^{th} segment is the start of the (n+1)th(n + 1)^{th} segment. Line segments drawn are allowed to intersect and even overlap previously drawn segments. After drawing a finite number of line segments, Ziquan stops and hands in his drawing to his art teacher. He passes the course if the drawing he hands in is an NN by NN square, for some positive integer NN , and he fails the course otherwise. Is it possible for Ziquan to pass the course?

    Dataset text AI-MO AoPS. Quoted with source.

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