文件名称:thethirdwork_1
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按照古希腊三角几何,如果一定数目的卵石可以排列成对称的三角几何图形,则该数字被称为“三角形数”。例如,前10个三角形数分别为0,1,3,6,10,15,21,28,36,45。-In accordance with the ancient Greek trigonometry, if a certain number of pebbles can be arranged in a symmetrical triangle geometry, the number is called " triangular number. For example, the 10 triangles were 0,1,3,6,10,15,21,28,36,45.
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thethirdwork_1.cpp