Compilare: user.cpp: In function ‘int rez(int, std::map<char, int>)’: user.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<ar.size();i++) ^ user.cpp:69:46: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty()&&p[op.top()]>=p[ar[i]])//operator ^ user.cpp:69:56: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty()&&p[op.top()]>=p[ar[i]])//operator ^ user.cpp:36:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘int rec(char, int&)’: user.cpp:87:17: warning: unused variable ‘j’ [-Wunused-variable] int d=1,v=0,j; ^ user.cpp: In function ‘int main()’: user.cpp:119:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<in.size();i++) ^ user.cpp:132:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<in.size();j++) ^