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Problem 85


Problem 85


Counting rectangles

By counting carefully it can be seen that a rectangular grid measuring $3$ by $2$ contains eighteen rectangles:

Although there exists no rectangular grid that contains exactly two million rectangles, find the area of the grid with the nearest solution.


数长方形

在一个$3\times2$的长方形网格中包含有$18$个不同大小的长方形,如下图所示:

不存在任意大小的长方形网格中包含有恰好两百万个长方形。求包含长方形的数目最接近两百万的长方形网格的面积。