Compilare: user.cpp: In function ‘int cmlsc(int, int)’: user.cpp:31:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] return b[nr1][nr2]; ^ user.cpp:31:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] return b[nr1][nr2]; ^ user.cpp: In function ‘int main()’: user.cpp:40:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<strlen(s);i++) ^