Compilare: user.cpp: In function ‘void extend_tree(const char*, int, Node*&, int&, int&, int&, int*)’: user.cpp:55:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(active_node->children[s[active_edge]] == NULL) ^ user.cpp:57:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] active_node->children[s[active_edge]] = new Node(pos, END); ^ user.cpp:67:62: warning: array subscript has type ‘char’ [-Wchar-subscripts] Node* next = active_node->children[s[active_edge]]; ^ user.cpp:86:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] active_node->children[s[active_edge]] = split; ^ user.cpp:88:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] split->children[s[pos]] = new Node(pos, END); ^ user.cpp:90:43: warning: array subscript has type ‘char’ [-Wchar-subscripts] split->children[s[next->start]] = next; ^ user.cpp: In function ‘int isSubstring(Node*, const char*, const char*, int)’: user.cpp:157:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(node->children[ss[pos]] != NULL) ^ user.cpp:158:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] return isSubstring(node->children[ss[pos]], s, ss,pos); ^ user.cpp:168:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == strlen(ss)-1) ^ user.cpp:174:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(node->children[ss[pos]] != NULL) ^ user.cpp:175:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] return isSubstring(node->children[ss[pos]], s, ss,pos); ^