Compilare: user.c: In function ‘main’: user.c:13:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%lld", &n, &s); ^ user.c:15:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &v[i]); ^ user.c:24:10: warning: ‘sc’ may be used uninitialized in this function [-Wmaybe-uninitialized] sc -= 2 * v[p1[x]]; ^