Compilare: main.cpp: In member function 'InParser& InParser::operator>>(std::string&)': main.cpp:44:12: warning: suggest parentheses around assignment used as truth value [-Wparentheses] 44 | while (c = read_ch()) { | ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:177:7: warning: unused variable 'st' [-Wunused-variable] 177 | int st = i + 1, dr = n; | ^~ main.cpp:177:19: warning: unused variable 'dr' [-Wunused-variable] 177 | int st = i + 1, dr = n; | ^~