The fruits our teacher gave us the night before the provincal election
Morning sunlight outside the computer room on the sixth floor
Sunlight in the library
Morning sunlight outside the computer room on the eighth floor
My identity tags in training sessions and competitions
Draft for a Plug DP problem
Blackboard before going to NOIP2017
Every night, the windows of the building opposite the computer room are lit with lights of different colors
We take part in a high school deciphering contest
One day, I saw a small crab outside the computer room on the eighth floor! I never figured out how it got up there
Just a random award certificate
During a competition, the organizer gave out many cartons of milk every day. My friends and I saved up the milk until the last day and stacked it into a pyramid
Looking up from the corridor outside the computer room
The sunlight somehow forms a two-dimensional coordinate system in the picture