〇〇 发表于 2009-11-3 21:15:16

Puzzleup No: 15 October 28, 2009

No: 15       October 28, 2009

Grid


A 2x2 grid can be achieved by drawing three squares on a sheet. How many squares (in minimum) are needed to get a 8x8 grid?

geslon 发表于 2009-11-3 22:17:06

是14吧。

〇〇 发表于 2009-11-4 08:49:34

具体怎么分析的

sjymb 发表于 2009-11-4 12:08:40

咳,错了,我是15.

〇〇 发表于 2009-11-4 12:36:38

2*23
3*3 5
4*47
5*59
外圈1个,对角线(n-1)*2

raa 发表于 2009-11-7 11:36:53

引申:在边长为8的正三角形的网格图,至少要画几个正三角形?

geslon 发表于 2009-11-8 00:16:02

5楼说4*4,7个,错了
4*4,只需6个

〇〇 发表于 2009-11-8 08:57:00

是的,最外圈n正方形可以用外圈4个n-1正方形代替,然后(n-3)*2
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