Compilare: main.cpp: In function 'void dfs(Trie*)': main.cpp:57:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<nod->adj.size(); i++){ ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:42: 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); ^ main.cpp:64:44: 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); ^ main.cpp:66:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", a); ^ main.cpp:68:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ main.cpp:70:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^