Codeforces

2021

January

• Codeforces Edu. Round #102 (Div. 2) [Personal Summary] January 15
• Codeforces Round #690 (Div. 3) [Personal Summary] January 8

2019

March

• Codeforces 1133D. Zero Quantity Maximization (map, 精度) March 10

2018

September

• Codeforces 1030A. In Search of an Easy Problem(Codebait) [Codeforces Round September 24
• Codeforces Round #512 (Div. 2) [Personal Summary] September 24