A Path Plan（求兩個人從y軸不想交走到x軸有多少方案數）

A Path Plan 時間限制: 1 Sec  內存限制: 128 MB 題目描述 WNJXYK hates Destinys so that he does not want to meet him at any time. Luckily, their classrooms and dormitories are at different places. The only chance fo

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