摘要：
#include <iostream> #include <string> #include <cstdio> #include <cmath> #include <cstring> #include <algorithm> #define range(i, a, b) for (int i = a 阅读全文
摘要：
FFT: #include <bits/stdc++.h> #define ll long long #define inf 0x3f3f3f3f #define db double #define Pi acos(-1) #define eps 1e-8 #define N 400005 usin 阅读全文