Tiejun XU@bjxutjFollow BadgesProblem SolvingPythonDays of Code CertificationsCertificate: Problem Solving (Basic)VerifiedskillWork ExperienceProgrammerIxiasoftEducationbjxutj has not updated education details yet.Linksbjxutj has not updated links details yet. Skillsbjxutj has not updated skills details yet.