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★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★ You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time one of you take turns to remove 1 to 3 stones. The one who removes the last stone will be the winner. You will take the first turn to remove the stones. Both of you are very clever and have optimal strategies for the game. Write a function to determine whether you can win the game given the number of stones in the heap. Example: Input:
你和你的朋友,两个人一起玩 Nim游戏:桌子上有一堆石头,每次你们轮流拿掉 1 - 3 块石头。 拿掉最后一块石头的人就是获胜者。你作为先手。 你们是聪明人,每一步都是最优解。 编写一个函数,来判断你是否可以在给定石头数量的情况下赢得游戏。 示例: 输入:
1 class Solution { 2 func canWinNim(_ n: Int) -> Bool { 3 //若n=k*(m+1),则后取着胜 4 //反之,存在先取者获胜的取法。n%(m+1)==0 ,先取者必败 5 return n % 4 != 0 6 } 7 }
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