Compilare: main.cpp: In function 'int main()': main.cpp:30:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<s.size();i++) { ~^~~~~~~~~ main.cpp:31:24: warning: array subscript has type 'char' [-Wchar-subscripts] lin+=dx[op[s[i]]]; ^ main.cpp:32:24: warning: array subscript has type 'char' [-Wchar-subscripts] col+=dy[op[s[i]]]; ^