#include <bits/stdc++.h> #include <sstream> #include <vector> using namespace std; //11.27 int A = 0, B = 0, C = 0, D = 0, E = 0, wrong = 0, p = 0; //p是私有 bool isvalid_mask(string mask) { int res[32];//存放掩码的二进制 for (int i = 0; i < 32; i++) res[i] = 0; stringstream ss(mask); stri...