摘要：
"题目" 组合数大模拟，没什么好说的，注意一下$0$的特判 还有我现在码力真的差 代码 cpp include include include include define re register const int maxn=100005; const int mod=998244353; inl 阅读全文
摘要：
存板子，这玩意死难写好像也没啥用啊 不想学CH定理了，等以后学了再来补一下原理吧 cpp include include include define re register inline int read() { char c=getchar();int x=0,r=1;while(c'9') { 阅读全文