Compilare: user.cpp: In function ‘int main()’: user.cpp:34:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < sir.length(); j++) ^ user.cpp:36:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(frec[sir[j]] == 0) ^ user.cpp:38:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] frec[sir[j]] = ch; ^ user.cpp:41:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] cuvant = cuvant + (char)frec[sir[j]]; ^ user.cpp:53:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < sir.length(); j++) ^ user.cpp:55:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(frec[sir[j]] == 0) ^ user.cpp:57:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] frec[sir[j]] = ch; ^ user.cpp:60:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] cuvant = cuvant + (char)frec[sir[j]]; ^