Compilare: user.cpp: In function ‘int main()’: user.cpp:42:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!S -> son[c]) ^ user.cpp:43:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] S -> son[c] = new Trie(); ^ user.cpp:44:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] S = S -> son[c]; ^ user.cpp:73:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(S != T && !S -> son[v[i]]) ^ user.cpp:75:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(S -> son[v[i]]) ^ user.cpp:76:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] S = S -> son[v[i]]; ^ user.cpp:35:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &n); ^