Compilare: user.c: In function ‘main’: user.c:23:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.c:26:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^ user.c:53:12: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%d %d\n", a+1, b+1); ^ user.c:53:12: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized]