Compilare: user.cpp: In function ‘int main()’: user.cpp:25:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<C.size(); j++) ^ user.cpp:27:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (ok[C[j]]==0) ^ user.cpp:30:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] ok[C[j]]=nr; ^ user.cpp:35:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] s+=ok[C[j]]+'0'; ^ user.cpp:40:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] s+=(ok[C[j]] / 10)+'0'; ^ user.cpp:41:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] s+=(ok[C[j]] % 10)+'0'; ^ user.cpp:54:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<C.size(); j++) ^ user.cpp:56:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (ok[C[j]]==0) ^ user.cpp:59:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] ok[C[j]]=nr; ^ user.cpp:64:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] s+=ok[C[j]]+'0'; ^ user.cpp:69:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] s+=(ok[C[j]] / 10)+'0'; ^ user.cpp:70:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] s+=(ok[C[j]] % 10)+'0'; ^