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HDU1907(尼姆博弈)

时间:2015-10-28 12:06:36      阅读:189      评论:0      收藏:0      [点我收藏+]

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John

Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others)
Total Submission(s): 3762    Accepted Submission(s): 2127

Problem Description
Little John is playing very funny game with his younger brother. There is one big box filled with M&Ms of different colors. At first John has to eat several M&Ms of the same color. Then his opponent has to make a turn. And so on. Please note that each player has to eat at least one M&M during his turn. If John (or his brother) will eat the last M&M from the box he will be considered as a looser and he will have to buy a new candy box.

Both of players are using optimal game strategy. John starts first always. You will be given information about M&Ms and your task is to determine a winner of such a beautiful game.

Input
The first line of input will contain a single integer T – the number of test cases. Next T pairs of lines will describe tests in a following format. The first line of each test will contain an integer N – the amount of different M&M colors in a box. Next line will contain N integers Ai, separated by spaces – amount of M&Ms of i-th color.

Constraints:
1 <= T <= 474,
1 <= N <= 47,
1 <= Ai <= 4747
 
Output
Output T lines each of them containing information about game winner. Print “John” if John will win the game or “Brother” in other case.

Sample Input
2
3
3 5 1
1
1
 
Sample Output
John
Brother
 
Source
 
n堆物品,每次从一堆中取至少一个,取到最后一个的败,John先取,Brother后取,输出胜利者的名字
这种类型的尼姆博弈,必胜态有S2,S1,T0,必败态有T2,S0,具体参考前面关于三种博弈的总结。
 
int main() {

    int T, n;
    scanf("%d", &T);
    while (T --) {
        scanf("%d", &n);
        int res = 0, cnt = 0, tmp;
        for (int i = 1; i <= n; i ++) {
            scanf("%d", &tmp);
            res ^= tmp;
            if (tmp > 1) cnt ++;
        }
        if ((res == 0 && cnt == 0) || (res && cnt)) printf("John\n");
        else printf("Brother\n");
    }

    return 0;
}

 

HDU1907(尼姆博弈)

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原文地址:http://www.cnblogs.com/LinKArftc/p/4916567.html

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