題目鏈接
kiki’s game
Time Limit: 5000/1000 MS (Java/Others) Memory Limit: 40000/10000 K (Java/Others)
Total Submission(s): 13497 Accepted Submission(s): 8238

Problem Description
Recently kiki has nothing to do. While she is bored, an idea appears in his mind, she just playes the checkerboard game.The size of the chesserboard is n*m.First of all, a coin is placed in the top right corner(1,m). Each time one people can move the coin into the left, the underneath or the left-underneath blank space.The person who can’t make a move will lose the game. kiki plays it with ZZ.The game always starts with kiki. If both play perfectly, who will win the game?

Input
Input contains multiple test cases. Each line contains two integer n, m (0<=2000). The input is terminated when n=0 and m=0.

Output
If kiki wins the game printf “Wonderful!”, else “What a pity!”.

Sample Input
5 3
5 4
6 6
0 0

Sample Output
What a pity!
Wonderful!
Wonderful!
意思是一個棋子只能往左面，下面，或者左下走。不能走的那個輸。kiki先走。
分析一下走法：

O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O NNNNNNNN PNPNPNPN NNNNNNNN PNPNPNPN NNNNNNNN PNPNPNPN NNNNNNNN PNPNPNPN

先考慮走直線，不難發現：如果走直線，向左，向下。從左下角開始找P/N點。畫出圖。

• 必敗點(P點) :前一個選手(Previous player)將取勝的位置稱為必敗點。
• 必勝點(N點) :下一個選手(Next player)將取勝的位置稱為必勝點。
  最后一個點（左下角必敗），因為他的前一個人走到該點他就輸了。
  相反，他的附近三個點都是必勝點，因為這個人走一步就贏了。
  所以分析pn圖可以發現（n%2==0）或者（m%2= =0）都是 必勝的。
  附上代碼如下：

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.io.StreamTokenizer;public class hdu2147 {public static void main(String[] args) throws IOException {StreamTokenizer in=new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out)); while(in.nextToken()!=StreamTokenizer.TT_EOF){int n=(int)in.nval;in.nextToken();int m=(int)in.nval;if(m==0&&n==0) {break;}if(m%2==0||n%2==0){out.println("Wonderful!");}else{out.println("What a pity!");}out.flush(); }} }

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