@[_B_T_C_](/user/209758) 这题要$O2$
by _l_l_l_l_l_ @ 2021-08-11 09:16:08
@[WenZKbb](/user/522828) 有WA应该不是O2的问题
by AdGats @ 2021-08-11 09:28:47
@[_B_T_C_](/user/209758) k要赋值成1
by Nt_Tsumiki @ 2021-10-08 20:44:30