@airy 数字应该是正方形的个数吧。上面那个图，有5个正方形，边长为1的4个，边长为2的正方形1个。下面那个图，边长为1的正方形9个，边长为2的正方形4个，边长为3的正方形1个，总共有9+4+1=14个正方形。
@bgme @airy 厉害厉害，这个5代表的意思有点隐晦
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