找出欧洲地图的四种颜色
找出每个欧洲国家的邻国.
| In[1]:= |  X |
以下为奥地利的邻国.
| In[2]:= |  X |
| Out[2]= |  |
对每个国家用两个布尔值 
进行4种可能颜色的编码.
| In[3]:= |  X |
| In[4]:= |  X |
以所有接壤国家的组合为不同颜色的逻辑表达式表达条件.
| In[5]:= |  X |
计算四色问题的解.
| In[6]:= |  X |
排列着色.
| In[7]:= |  X |
| Out[7]= |  |
根据找出的颜色对每个国家着色.
| In[8]:= |  X |
| Out[8]= |  |
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