Compilare: main.cpp: In function 'void evaluate(int)': main.cpp:33:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | if (i == expresie.size()) | ~~^~~~~~~~~~~~~~~~~~ main.cpp:76:52: warning: array subscript has type 'char' [-Wchar-subscripts] 76 | while (!ops.empty() && priority[expresie[i]] <= priority[ops.top()]) | ^ main.cpp:76:73: warning: array subscript has type 'char' [-Wchar-subscripts] 76 | while (!ops.empty() && priority[expresie[i]] <= priority[ops.top()]) | ~~~~~~~^~