中文说明：2018美赛B题思路！（最新版，只需要1军费！）
English Description：
The idea of problem B in 2018 US championship! (the latest version, only 1 Military cost!)
The idea of problem B in 2018 US championship! (the latest version, only 1 Military cost!)
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中文说明：2018美赛B题思路！（最新版，只需要1军费！）
English Description：
The idea of problem B in 2018 US championship! (the latest version, only 1 Military cost!)2018美赛B题思路.pdf