Compilare: user.cpp: In function ‘void insert(Trie*, int)’: user.cpp:48:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(v[r] != str[lvl]) ^ user.cpp:50:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod -> son[r] == NULL) ^ user.cpp:51:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod -> son[r] = new Trie; ^ user.cpp:52:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] insert(nod -> son[r], lvl + 1); ^ user.cpp:57:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod -> son[win[i]] != NULL) ^ user.cpp:58:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod -> dp[i] = nod -> son[win[i]] -> cnt * w; ^