Problem 1002 能解释一下样例吗

qieqiemin | 2019-08-24 14:09:52Author
能解释一下样例吗
admin | 2019-08-24 14:13:10# 1
D(2,4)=D(4,2)=1 D(1,3)=D(3,1)=2 其他都为0
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