05 2020 档案
摘要:有两个平面向量 \((x_1, y_1)\),\((x_2,y_2)\)。已知: \((x_1, y_1)\) 与 \((x_2, y_2)\) 不共线 \(x_1, y_1, x_2, y_2\) 都是不超过 $1000$ 的正整数 试估计 \(\left|\frac{x_1}{\sqrt{x_1
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摘要:In graph theory, a caterpillar or caterpillar tree is a tree in which all the vertices are within distance 1 of a central path. The central path can b
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