Compilare: user.c: In function ‘main’: user.c:59:26: warning: unused variable ‘i’ [-Wunused-variable] int command, key, P, N, i; ^ user.c:62:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.in", "r", stdin); ^ user.c:63:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("hashuri.out", "w", stdout); ^ user.c:67:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] for (fscanf(stdin, "%d", &N); N; N--) ^ user.c:69:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(stdin, "%d %d", &command, &key); ^