Compilare: user.cpp: In function ‘int main()’: user.cpp:35:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < sir.length(); j++) ^ user.cpp:37:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(frec[sir[j]] == 0) ^ user.cpp:39:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] frec[sir[j]] = ch; ^ user.cpp:42:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] cuvant = cuvant + (char)frec[sir[j]]; ^ user.cpp:55:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < sir.length(); j++) ^ user.cpp:57:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(frec[sir[j]] == 0) ^ user.cpp:59:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] frec[sir[j]] = ch; ^ user.cpp:62:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] cuvant = cuvant + (char)frec[sir[j]]; ^