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ZoharAndroid
LeetCode
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/**
* 292. Nim游戏
* 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: 4
输出: false
解释: 如果堆中有 4 块石头,那么你永远不会赢得比赛;
因为无论你拿走 1 块、2 块 还是 3 块石头,最后一块石头总是会被你的朋友拿走。
* @author zohar
*
*/
public class _292 {
public static void main(String[] args) {
}
static class Solution {
/**
* 由于是我们先拿,那么3个以内(包括3个)的石子,我们直接赢,如果共4个,那么我们一定输,因为不管我们取几个,下一个人一次都能取完。如果共5个,我们赢,因为我们可以取一个,然后变成4个让别人取
* @param n
* @return
*/
public boolean canWinNim(int n) {
return n % 4 != 0;
}
}
}
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