Compilare: user.c: In function ‘main’: user.c:20:10: warning: unused variable ‘y’ [-Wunused-variable] int x, y; ^ user.c:20:7: warning: unused variable ‘x’ [-Wunused-variable] int x, y; ^ user.c:17:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%u%u", &n, &k); ^ user.c:21:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%u%u", &first[i], &second[i]); ^ user.c:42:11: warning: ‘answer’ may be used uninitialized in this function [-Wmaybe-uninitialized] answer += second[j]; ^