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不懂。。。。对于4个硬币 设为a，b,c,d 0为正面 ，1为反面 a0,b0,c,0,d0 作一次变化后得 d1,b1,a0,,c0 (应该没错吧） 对于b硬币，它的位置不变 那要得到b0不就要经过偶数次变换，那为什么答案是11 ???? 不懂。。。。。。。。。。。。。。 Followed by: Post your reply here: |
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