中文说明：刚刚找到另一篇B题思路的文章，很详细！！！！
English Description：
Just found another article about the idea of question B, very detailed!!!!
Just found another article about the idea of question B, very detailed!!!!
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中文说明：刚刚找到另一篇B题思路的文章，很详细！！！！
English Description：
Just found another article about the idea of question B, very detailed!!!!B题思路（详细）.pdf
B题思路分析.pdf