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====比赛情况====
A:
B:
C:
D:
E:
F:
G:
H:
I:
J:
K:
L:
====比赛过程====
wyl不在。
wzy上来开了个签到D，1A(18min)。
qshr也开了个签到K，wa了一次过了(40min -1)。
wzy写N，结果爆long long了，边界也没处理好，wa3次过了(54min -3)。
wzy看C是个生成函数，推出了式子，不太会写ntt就放在旁边了。
之后qshr想A，wzy想H，H感觉可以xjb构造，试了下过了(112min)。
qshr的A想到了一半卡住了，开始推L，wzy接着想A。
wzy发现A可以倒着推，结果排序没处理好wa了一次，之后过了(212min -1)。
qshr写L一直wa，wzy怀疑式子推错了，想再推一遍，就让qshr写C。
结果wzy把余弦定理搞错了，一直写不对，qshr的C也没写出来。寄！
dirt:
A(-1) K(-1) N(-3)
====总结====
严重缺乏数理基础，C和L都应该过的————wzy