X000
XX00
X0X0
X00X
XXX0
XX0X
X0XX
XXXX
剩下的8个是上述的X和0对换,删去不考虑。
其中4个X000,XXX0,X0XX, XX0X结果为奇,另外4的为偶,所以50%
X000
XX00
X0X0
X00X
XXX0
XX0X
X0XX
XXXX
剩下的8个是上述的X和0对换,删去不考虑。
其中4个X000,XXX0,X0XX, XX0X结果为奇,另外4的为偶,所以50%
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