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[DhtmlXQ_adddate]2014-08-16 00:24:33[/DhtmlXQ_adddate]
[DhtmlXQ_editdate]2014-08-16 00:24:33[/DhtmlXQ_editdate]
[DhtmlXQ_title]牛顶[/DhtmlXQ_title]
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[DhtmlXQ_event]纹枰老妖作 zqhuang解局[/DhtmlXQ_event]
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[DhtmlXQ_comment0]||||纹枰老妖作 zqhuang解局[/DhtmlXQ_comment0]
[DhtmlXQ_comment2]现在距离是1,4,8||写成二进制数分别为||0001||0100||1000||当至少有一位上的1的总个数是单数时(本局中个位,百位,千位都是如此),目前轮到走的一方可以取胜。取胜法则是,每一次都把每一位上的1的个数都变成偶数(这总是可以做到的,因为只要改变最高位多出来那个1,后面可以随意选择0或1)。[/DhtmlXQ_comment2]
[DhtmlXQ_comment3]红方把距离走成1,4,5||也就是二进制的||0001||0100||0101||所有位上的1的总个数都是双数个了。现在轮到走的一方就会输,因为不管怎么走,最高变动的一位必然会有单数个1.||而对方可以始终保持所有位上都有偶数个1。(直到最终胜利状态——所有位上都是0个1)。[/DhtmlXQ_comment3]
[DhtmlXQ_comment4]仅举一例,黑方这样走。距离成为1,2,5||写成二进制数||001||010||101||百位,十位上都是单数个1.||按从高到低改变的方法,红方应该改变101为011,这样所有位上1的总个数又成为偶数。[/DhtmlXQ_comment4]
[DhtmlXQ_comment5]现在距离是1,2,3||写成二进制||001||010||011||黑方无论怎么走都会破坏每一位上都有偶数个1的状态。[/DhtmlXQ_comment5]
[DhtmlXQ_comment6]例如这样,||变成0,2,3||二进制||00||10||11||显然红方只要把11变成10就行了[/DhtmlXQ_comment6]
[DhtmlXQ_comment9]下面不用法则心算也能取胜了[/DhtmlXQ_comment9]
[DhtmlXQ_comment21]红胜[/DhtmlXQ_comment21]
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