输出格式
一行一个整数，表示 ... 对 1e9+7 取膜后的结果。
—— 摘自原题
鹅鹅鹅(⊙﹏⊙)应该是打错了
这是哪道题？
qp
1
zhenzitou
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Royal LV 3 @ 2024-9-21 13:45:32
@ 2024-9-21 8:09:12
@ 2024-9-17 17:43:14
