一開始憑直覺我選2，因為選2的話，只要1不死，你就不可能死，因為你一直是偶數，而排在隊尾的人會不斷變化奇偶，一直有死亡的風險...
然後我就寫程式碼模擬了一下，測試了十萬次，看幾號活下來的次數最多，結果如下：
前面是號碼，後面是活下來的次數。
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可以看出有點反直覺，號碼越大活下來的次數越多，2反而一次都沒有幸存過...講道理2應該是有機會的，若且唯若1號和2號是最後兩個幸運兒的情況下，2號能活到最後；只要前面1死了，2必死，因為2號變成奇數了，且永遠是奇數...
然後我又換了一個思路，不是找出最後一個活下來的人，而是找每個位置被幹掉時的平均輪次，期望最大的位置就是在"殺死X人後就停止遊戲"模式下，最該選的位置。這種情況下，2才是最優解，10W次平均下來可以活334輪。
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