ОИОлег Иванов@klepathebestUkraineFollowAboutEducationno schoolVerified SkillsCertificate: Problem Solving (Basic)VerifiedBadgesProblem SolvingJavaDays of CodeEducationno schoolRatingsSubmissionsUser has not solved any challenges yet.Contest HistoryUser has not participated in any contests yet.DiscussionsUser doesn't have any discussions yet.