Charles Chien

@cchien101

United States, Boston

Joined Jun 2020

World Rank: #31960 (0.8 points)

Institution: N/A

Activity over the last year

Effectiveness

 Problems solved
8
 Solutions submitted
10

Problems

List of solved classical problems:

GNYR04H TWINSNOW
HISTOGRA
MTREECOL
NAPTIME
PERIOD
PHONELST
SERVICE