Compilare: main.cpp: In function 'void update1(const string&)': main.cpp:41:23: warning: array subscript has type 'char' [-Wchar-subscripts] 41 | if (!node->children[c]) { | ^ main.cpp:42:19: warning: array subscript has type 'char' [-Wchar-subscripts] 42 | node->children[c] = new Node(node); | ^ main.cpp:43:19: warning: array subscript has type 'char' [-Wchar-subscripts] 43 | node->children[c]->c = c; | ^ main.cpp:46:25: warning: array subscript has type 'char' [-Wchar-subscripts] 46 | node = node->children[c]; | ^ main.cpp: In function 'void update2(const string&)': main.cpp:55:25: warning: array subscript has type 'char' [-Wchar-subscripts] 55 | node = node->children[c]; | ^ main.cpp:62:21: warning: array subscript has type 'char' [-Wchar-subscripts] 62 | p->children[node->c] = nullptr; | ~~~~~~^ main.cpp: In function 'int query1(const string&)': main.cpp:73:23: warning: array subscript has type 'char' [-Wchar-subscripts] 73 | if (!node->children[c]) | ^ main.cpp:75:25: warning: array subscript has type 'char' [-Wchar-subscripts] 75 | node = node->children[c]; | ^ main.cpp: In function 'int query2(const string&)': main.cpp:85:23: warning: array subscript has type 'char' [-Wchar-subscripts] 85 | if (!node->children[c]) | ^ main.cpp:88:25: warning: array subscript has type 'char' [-Wchar-subscripts] 88 | node = node->children[c]; | ^