Compilare: user.c: In function ‘main’: user.c:18:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^~~~~~~~~~~~~~~~~~~~ user.c:20:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &v[i]); ^~~~~~~~~~~~~~~~~~~~~~~ user.c:39:5: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (i = n-2; i >= p+1; i--) { ^~~