7、Floyd-dijkstra路径
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丁岩透露道：“林知夏在我们班的绰号是怪胎。她好聪明，你们要小心。”</p>
“她才九岁，”聂天清说，“再聪明能聪明到哪儿去。”</p>
丁岩脸色微变：“她背书只要三秒钟！”</p>
聂天清不信。</p>
丁岩愤怒道：“真的！我骗你是小狗！”</p>
甘姝丽也说：“真的，她好聪明。”</p>
“你们不要长他人志气，灭自己威风，”聂天清像一位哥哥一样教育他们，“对手没有那么可怕。我们有三个人，对她出石头剪刀布，难道赢不过她吗？我们每一个人的获胜概率都是百分之五十！”</p>
“有道理！”应话的人，是林知夏。</p>
林知夏顺着聂天清的意思，对他们说：“百分之五十的三次方等于0.125，我的获胜概率只有0.125。”</p>
聂天清问：“为什么是0.125？”</p>
林知夏歪头：“我必须赢过你们每一个人。第一次获胜概率是0.5，第二次0.25，第三次0.125……这不是你说的吗？你假设两两对战的获胜概率都是0.5……”</p>
聂天清皱着眉毛：“但是，林知夏，你和我们玩石刀剪刀布，只要你输了一次，你就不能再继续。为什么你还用0.5的幂次方来算概率？”</p>
“你这样想呀，”林知夏耐心地解释，“我和你们三个人玩，一共会出现四种结果。第一种结果，我第一局就输，这个概率是0.5。第二种结果，我第二局输，概率是0.25。第三种结果，我第三局输，概率是0.125，第四种结果，我第三局赢，概率也是0.125。这几个概率事件之和，正好等于1，你算一算？我能进入第二局和第三局的前提条件都是，我上一局就赢了。不过，你要知道，上一局的获胜，并不是最终状态。”</p>
</p>
聂天清恍然大悟，右手成拳，锤进左手的掌心：“我想通了。”</p>
他扭头看着两位同伴：“高兴吗！我们有0.875的概率能赢！”</p>
丁岩有些颤抖：“聂天清，她讲了这么多，你还觉得你自己能赢？她肯定是骗你玩的。我不信。”</p>
聂天清绕开了丁岩。他走向林知夏，充满战意地说：“开始吧，林知夏，石刀剪刀布。”</p>
林知夏开心应好。</p>
随后，他们二人同时出招——聂天清出了石头，林知夏出了布。</p>
聂天清心中一惊，原地定格。</p>
林知夏双手拍掌，跳到丁岩面前。</p>
丁岩的内心恐惧极了。他硬着头皮，亮出剪刀，林知夏则是石头。丁岩一脸“我早就知道”的表情，也开始倒数三分钟的冰冻秒数。</p>
丁岩小组的人，只剩下一个甘姝丽。</p>
全组的希望，都寄托在了甘姝丽的身上。</p>
甘姝丽口齿不清道：“我……剪刀石头……”</p>
“甘姝丽，”林知夏拍了拍她的肩膀，“你不要紧张。”</p>
隧道节点是一个封闭的空间。左右两侧各贴着一扇玻璃窗，顶端开着排气孔，甘姝丽向外一望，能望见蹦床、滑索、吊灯。她把心一横，直面林知夏：“林知夏！石头剪刀布！”</p>
话音落后，她张开五指，做成“布”形。</p>
而林知夏的出招，好像比甘姝丽更早。她早在甘姝丽反应过来之前，就已经比了个剪刀手。</p>
甘姝丽满脸惊讶：“你……又赢了。”</p>
林知夏笑着说：“哎呀，全靠运气啦。”</p>
林知夏心里想的却是——全靠运气让她天生和大家不一样。通过各种细节观察，她才能预测到每一位同学的行为。</p>
甘姝丽为她鼓掌：“运气真好。”</p>
“我说过了吧！”丁岩警告聂天清，“我早就知道！我们赢不了她！”</p>
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