Shifeng Xu@xsfpkuSingaporeFollow BadgesProblem Solving CertificationsCertificate: Problem Solving (Basic)VerifiedskillCertificate: Problem Solving (Intermediate)VerifiedskillCertificate: Problem Solving (Advanced)VerifiedskillWork Experiencexsfpku has not updated employment details yet.Educationxsfpku has not updated education details yet.