View Compilation Error

0_0_39664878_28223.cpp: In member function 'void AC::query(std::string)':
0_0_39664878_28223.cpp:152:29: error: 'ac' was not declared in this scope; did you mean 'AC'?
  152 |                         if (ac.slen[u]) {
      |                             ^~
      |                             AC