Compilare: user.c: In function ‘pop’: user.c:70:9: warning: unused variable ‘i’ [-Wunused-variable] int i, au = a[0]; ^ user.c: In function ‘main’: user.c:127:27: warning: assignment makes integer from pointer without a cast [enabled by default] a[ord[x]] = p; ^ user.c:99:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, instr, n_ex; ^ user.c:95:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.in", "r", stdin); ^ user.c:96:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.out", "w", stdout); ^ user.c:100:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n_ex); ^ user.c:105:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &instr); ^ user.c:108:18: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.c:114:18: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^