如图有一个三角形点阵从上�下有无数多行其中第一行有1个点第二行有2个点 第n行有n个点1容易�现10是三角点阵中前4行的点数之和 Template




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tomski如图有一个三角形点阵从上�下有无数多行其中第一行有1个点第二行有2个点 第n行有n个点1容易�现10是三角点阵中前4行的点数之和 coloring