Compilare: user.cpp: In function ‘int main()’: user.cpp:64:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < strlen(c); i++){ ^ user.cpp: In function ‘void dfs(Trie*)’: user.cpp:90:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < T->v.size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:32:39: 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:33:41: 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:34:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", c); ^ user.cpp:35:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:37:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^ user.cpp: In function ‘Trie* pushTrie(Trie*, char*)’: user.cpp:86:1: warning: control reaches end of non-void function [-Wreturn-type] } ^