Compilare: main.cpp: In function 'bool solve(int)': main.cpp:75:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 75 | for (i = poz; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp: In function 'bool doOp(char, bool, bool)': main.cpp:68:1: warning: control reaches end of non-void function [-Wreturn-type] 68 | } | ^