Compilare: user.cpp: In function ‘node* go(Node, char)’: user.cpp:43:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(it->go[c]) return it->go[c]; ^ user.cpp:43:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(it->go[c]) return it->go[c]; ^ user.cpp:44:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(it->next[c]) return it->go[c] = it->next[c]; ^ user.cpp:44:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(it->next[c]) return it->go[c] = it->next[c]; ^ user.cpp:44:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(it->next[c]) return it->go[c] = it->next[c]; ^ user.cpp:46:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] return it->go[c] = go(getLink(it), c); ^ user.cpp: In function ‘int main()’: user.cpp:50:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.in", "r", stdin); ^ user.cpp:51:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ahocorasick.out", "w", stdout); ^ user.cpp:52:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s %d", s, &n); ^ user.cpp:53:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i = 1; i <= n; ++i) scanf(" %s", c), insert(i); ^