Compilare: user.c: In function ‘main’: user.c:29:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("bcrc.in", "rt", stdin); ^ user.c:30:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("bcrc.out", "wt", stdout); ^ user.c:31:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf(" %d %d ", &N, &M); ^ user.c:35:8: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(tmp, 32, stdin); ^