Compilare: main.c: In function 'main': main.c:81:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen( "trie.in", "r", stdin ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:82:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen( "trie.out", "w", stdout ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:86:2: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets( line, 32, stdin ); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:95:3: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets( line, 32, stdin ); ^~~~~~~~~~~~~~~~~~~~~~~~