Compilare: user.c: In function ‘main’: user.c:103:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in", "r", stdin); ^ user.c:104:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.out", "w", stdout); ^ user.c:110:15: warning: ‘word’ is used uninitialized in this function [-Wuninitialized] while (scanf("%d %s", &type, word) == 2) { ^