Compilare: user.cpp:9:1: warning: ‘typedef’ was ignored in this declaration typedef struct trie{ ^~~~~~~ user.cpp: In function ‘int main()’: user.cpp:61:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "trie.in", "r", stdin ); ^ user.cpp:62:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "trie.out", "w", stdout ); ^ user.cpp:64:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets( line, 32, stdin ); ^ user.cpp:74:33: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets( line, 32, stdin ); ^