fix flipped order of sorting
fix flipped order of sorting

ilinum/utacm_icpc_autojudge,chenclee/utacm_icpc_autojudge,ilinum/utacm_icpc_autojudge,ilinum/utacm_icpc_autojudge,ilinum/utacm_icpc_autojudge,chenclee/utacm_icpc_autojudge,chenclee/utacm_icpc_autojudge,chenclee/utacm_icpc_autojudge,ilinum/utacm_icpc_autojudge,chenclee/utacm_icpc_autojudge,chenclee/utacm_icpc_autojudge,ilinum/utacm_icpc_autojudge