Kazuhiro Niwa@hirokazu1020JapanFollowAboutEducationRyukoku University, KyōtoMore about meI'm sleepy.BadgesProblem SolvingSqlEducationRyukoku University, KyōtoRatingsSubmissionsUser has not solved any challenges yet.Contest History555User has not participated in any contests yet.DiscussionsUser doesn't have any discussions yet.