Compilare: user.cpp: In function ‘int main()’: user.cpp:18:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<=strlen(v); i++) ^ user.cpp:20:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[v[i]]++;//// creste vrecventa valorii v[i] ^ user.cpp:22:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<=strlen(v); i++) ^ user.cpp:24:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(a[v[i]]>1) {ok=1; break;} ^ user.cpp:13:18: warning: unused variable ‘j’ [-Wunused-variable] int ok=0, i, j, nr=0; ^ user.cpp:13:21: warning: unused variable ‘nr’ [-Wunused-variable] int ok=0, i, j, nr=0; ^