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1510 - Neon SignJungHeum recently opened a restaurant called ‘Triangle’ and has ordered the following neon sign for hisrestaurant. The neon sign has N... 阅读全文
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1350 - Pinary`Pinary" number is a positive number using only two digits ``0" and ``1" with usual rule that it must not begin with a 0, and the additio... 阅读全文
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12075 - Counting TrianglesTriangles are polygons with three sides and strictly positive area. Lattice triangles are the triangles all whose vertexes h... 阅读全文
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1393 - HighwaysHackerland is a happy democratic country withm×ncities, arranged in a rectangularmbyngrid and connected bymroads in the east-west direc... 阅读全文
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Problem E: How many 0's?A Benedict monk No. 16 writes down the decimal representations of all natural numbers between and includingmandn,m≤n. How many... 阅读全文