Compilare: main.cpp: In function 'int compute_function(char, const std::vector<int>&)': main.cpp:23:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int i = 0; i < operands.size(); ++i) | ~~^~~~~~~~~~~~~~~~~ main.cpp:28:33: warning: array subscript has type 'char' [-Wchar-subscripts] 28 | return compute_postfix(func[fun], vars); | ^~~ main.cpp: In function 'std::vector<std::__cxx11::basic_string<char> > infix_to_postfix(const std::vector<std::__cxx11::basic_string<char> >&)': main.cpp:63:49: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 63 | if(isdigit(token[0]) || token[0] >= 'a' && token[0] <= 'z') main.cpp: In function 'int compute_postfix(const std::vector<std::__cxx11::basic_string<char> >&, int*)': main.cpp:112:49: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 112 | if(isdigit(token[0]) || token[0] >= 'a' && token[0] <= 'z') main.cpp:120:47: warning: array subscript has type 'char' [-Wchar-subscripts] 120 | st.push(to_string(var[token[0]])); | ^ main.cpp:157:61: warning: array subscript has type 'char' [-Wchar-subscripts] 157 | func_operands = vector<int>(funcpar[token[0]], 0); | ^ main.cpp:158:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 158 | for(int i = 1; i <= func_operands.size() && !st.empty(); ++i) | ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:187:27: warning: array subscript has type 'char' [-Wchar-subscripts] 187 | var[temp[0][0]] = stoi(temp[2]); | ^ main.cpp:195:39: warning: array subscript has type 'char' [-Wchar-subscripts] 195 | funcpar[temp[0][0]]++; | ^ main.cpp:200:28: warning: array subscript has type 'char' [-Wchar-subscripts] 200 | func[temp[0][0]] = tokenize(s.substr(i)); | ^ main.cpp:201:28: warning: array subscript has type 'char' [-Wchar-subscripts] 201 | func[temp[0][0]] = infix_to_postfix(func[temp[0][0]]); | ^ main.cpp:201:64: warning: array subscript has type 'char' [-Wchar-subscripts] 201 | func[temp[0][0]] = infix_to_postfix(func[temp[0][0]]); | ^