Compilare: user.cpp: In function ‘void Insert(Aho*, char*, int)’: user.cpp:36:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->son[ch]==0) ^ user.cpp:37:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->son[ch]=new Aho; ^ user.cpp:38:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] Insert(nod->son[ch],str+1,pos); ^ user.cpp: In function ‘void solve()’: user.cpp:69:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->son[ch]==0) ^ user.cpp:70:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(nod!=root&&nod->son[ch]==0) ^ user.cpp:72:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->son[ch]){ ^ user.cpp:73:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod=nod->son[ch]; ^ user.cpp: In function ‘int main()’: user.cpp:93:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&m); ^