Compilare: user.cpp: In function ‘void Solve()’: user.cpp:62:93: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(o > 0 && k > 0 && stackOp[o] != '(' && priority[stackOp[o]] >= priority[ch]) { ^ user.cpp: In function ‘void Read()’: user.cpp:103:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < line.size() ; ++i) { ^ user.cpp:84:10: warning: unused variable ‘ch’ [-Wunused-variable] char ch; ^ user.cpp: In function ‘int Calculator(int, int, int)’: user.cpp:81:1: warning: control reaches end of non-void function [-Wreturn-type] } ^