Compilare: main.cpp: In function 'int main()': main.cpp:28:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size();++i) ~^~~~~~~~~ main.cpp:30:32: warning: array subscript has type 'char' [-Wchar-subscripts] if(!v[x].fiu[d[a[i]]]) ^ main.cpp:32:32: warning: array subscript has type 'char' [-Wchar-subscripts] v[x].fiu[d[a[i]]]=++k; ^ main.cpp:35:35: warning: array subscript has type 'char' [-Wchar-subscripts] else x=v[x].fiu[d[a[i]]]; ^ main.cpp:39:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<S.size();++i) ~^~~~~~~~~ main.cpp:43:32: warning: array subscript has type 'char' [-Wchar-subscripts] if(!v[x].fiu[d[S[j]]]) break; ^ main.cpp:44:30: warning: array subscript has type 'char' [-Wchar-subscripts] x=v[x].fiu[d[S[j]]]; ^