Compilare: user.c: In function ‘main’: user.c:17:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d", &N); ^ user.c:20:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1, "%d", &x); ^ user.c:57:19: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr++; ^ user.c:50:20: warning: ‘max_index’ may be used uninitialized in this function [-Wmaybe-uninitialized] vec[max_index] = 1; ^