HDU Balanced Game

HDU Balanced Game

题目描述：
Rock-paper-scissors is a zero-sum hand game usually played between two people, in which each player simultaneously forms one of three shapes with an outstretched hand. These shapes are “rock”, “paper”, and “scissors”. The game has only three possible outcomes other than a tie: a player who decides to play rock will beat another player who has chosen scissors (“rock crushes scissors”) but will lose to one who has played paper (“paper covers rock”); a play of paper will lose to a play of scissors (“scissors cut paper”). If both players choose the same shape, the game is tied and is usually immediately replayed to break the tie.

Recently, there is a upgraded edition of this game: rock-paper-scissors-Spock-lizard, in which there are totally five shapes. The rule is simple: scissors cuts paper; paper covers rock; rock crushes lizard; lizard poisons Spock; Spock smashes scissors; scissors decapitates lizard; lizard eats paper; paper disproves Spock; Spock vaporizes rock; and as it always has, rock crushes scissors.

Both rock-paper-scissors and rock-paper-scissors-Spock-lizard are balanced games. Because there does not exist a strategy which is better than another. In other words, if one chooses shapes randomly, the possibility he or she wins is exactly 50% no matter how the other one plays (if there is a tie, repeat this game until someone wins). Given an integer N, representing the count of shapes in a game. You need to find out if there exist a rule to make this game balanced.
Input：
The first line of input contains an integer t, the number of test cases. t test cases follow.
For each test case, there is only one line with an integer N (2≤N≤1000), as described above.

Here is the sample explanation.

In the first case, donate two shapes as A and B. There are only two kind of rules: A defeats B, or B defeats A. Obviously, in both situation, one shapes is better than another. Consequently, this game is not balanced.

In the second case, donate two shapes as A, B and C. If A defeats B, B defeats C, and C defeats A, this game is balanced. This is also the same as rock-paper-scissors.

In the third case, it is easy to set a rule according to that of rock-paper-scissors-Spock-lizard.
Output：
For each test cases, output “Balanced” if there exist a rule to make the game balanced, otherwise output “Bad”.
Sample Input
3
2
3
5
Sample Output
Bad
Balanced
Balanced
思路：直接给你定义了一种新的剪刀石头布，但是只看样例的输入和输出可以知道，所谓的Balanced 实际上就是，给定的任意种形状，不能有一种形状都能赢其它形状，所有当输入形状种类的个数为奇数时，一定能找到平衡，而偶数的时候却不能。
代码如下：

#include<bits/stdc++.h>

using namespace std;

int main()
{
	int t;
	cin >> t;
	while(t--)
	{
		int n;
		cin >> n;
		if(n % 2 == 0)  //也可以用n&1
			cout << "Bad" << endl;
		if(n % 2 != 0)
			cout << "Balanced" << endl;
	}
}