Compilare: user.c: In function ‘Y’: user.c:12:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:44:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in","r",stdin),freopen("trie.out","w",stdout),fgets(l,32,stdin); ^ user.c:44:38: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in","r",stdin),freopen("trie.out","w",stdout),fgets(l,32,stdin); ^ user.c:44:67: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in","r",stdin),freopen("trie.out","w",stdout),fgets(l,32,stdin); ^ user.c:54:14: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(l,32,stdin); ^