Compilare: user.cpp: In function ‘void add_trie(TRIE*, char*, int)’: user.cpp:41:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!(nod->fii[x])) ^ user.cpp:43:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->fii[x]=new TRIE; ^ user.cpp:44:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] TRIE &fiu=*nod->fii[x]; ^ user.cpp:53:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] add_trie(nod->fii[x],ch+1,lev+1); ^ user.cpp: In function ‘void query(TRIE*, char*)’: user.cpp:71:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!(nod->fii[x])) return; ^ user.cpp:72:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] query(nod->fii[x],ch+1); ^