Compilare: main.cpp: In function 'void antibfs(Trie*)': main.cpp:56:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < fr -> nd.size() ; j++) ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:62:40: 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); ^ 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.out","w",stdout); ^ main.cpp:65:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s); ^ main.cpp:66:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:69:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s",c); ^