Helloat123's Blog

乘进去之后是裸的卷积，FFT解决，卷积题熟练度++ //By Richard #include #include #include #include #include #include #include #define rep(x,y,z) for (int x=(y);(x)<=(z);(x)++) #define per(x,y,z) for (int x=(y);(x)>=(

还没搞清楚卷积到底是啥...大概就是多项式乘法? //By Richard #include #include #include #include #include #include #include #define rep(x,y,z) for (int x=(y);(x)<=(z);(x)++) #define per(x,y,z) for (int x=(y);(x)>=(z

研究母函数&容斥 刚开始没发现是不重复感觉大概很麻烦... 这篇题解不错 //By Richard #include #include #include #include #include #include #include #define rep(x,y,z) for (int x=(y);(x)<=(z);(x)++) #define per(x,y,z) for (i