Compilare: user.c: In function ‘back’: user.c:11:9: warning: unused variable ‘g’ [-Wunused-variable] FILE * g = fopen("cmlsc.out", "w"); ^ user.c: In function ‘main’: user.c:53:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.in", "r", stdin); ^ user.c:54:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.out", "r", stdout); ^ user.c:57:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &M, &N); ^ user.c:59:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ user.c:61:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &b[i]); ^