• Codeforces: Round #100 (Div.2) 2021-01-01 알고리즘 Codeforces

• Codeforces: Round #701 (Div.2) 2021-02-12 알고리즘 Codeforces

• Educational Codeforces: Round 104 (Div.2) 2021-02-15 알고리즘 Codeforces

• Codeforces: Round #702 (Div.3) 2021-02-16 알고리즘 Codeforces

• Codeforces: Round #704 (Div.2) 2021-02-23 알고리즘 Codeforces

• Educational Codeforces: Round 105 (Div. 2) 2021-03-02 알고리즘 Codeforces

• Codeforces: Round #705 (Div.2) 2021-03-06 알고리즘 Codeforces

• Codeforces: Round #706 (Div.2) 2021-03-10 알고리즘 Codeforces

• Codeforces: Round #708 (Div.2) 2021-03-17 알고리즘 Codeforces

• Codeforces: Round #710 (Div.3) 2021-03-25 알고리즘 Codeforces

• Codeforces: Round #711 (Div.2) 2021-03-29 알고리즘 Codeforces

• Codeforces: Round #713 (Div.3) 2021-04-10 알고리즘 Codeforces

• Codeforces: Round #714 (Div.2) 2021-04-11 알고리즘 Codeforces

• Educational Codeforces: Round 107 (Div. 2) 2021-04-12 알고리즘 Codeforces

• Codeforces: Round #715 (Div.2) 2021-04-16 알고리즘 Codeforces