Compilare: main.c: In function 'main': main.c:38:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:40:6: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:42:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^~~~~~~~~~~~~~~ main.c:46:28: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] for(i = 0; i < n; ++i) scanf("%d", p + i); ^~~~~~~~~~~~~~~~~~~