[閒聊] [LAG] 聽說這題目小孩子解得比大人快
http://tinyurl.com/86aj7se
轉自上述連結，懂得人別戳破XD
8809 = 6
7111 = 0
2172 = 0
6666 = 4
1111 = 0
3213 = 0
7662 = 2
9313 = 1
0000 = 4
2222 = 0
3333 = 0
5555 = 0
8193 = 3
8096 = 5
7777 = 0
9999 = 4
7756 = 1
6855 = 3
9881 = 5
5531 = 0
那麼，2581 = ?
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