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• Codeforces Round #700 (Div. 2) A ~ D1个人题解
• Codeforces Round #698 Div.2 （A~D题）个人题解记录
• Codeforces Round #695 (Div. 2)
• Codeforces Round #694 (Div. 2) A~D、E
• Codeforces Round #687 (Div. 2, based on Technocup 2021 Elimination Round 2) （个人题解)
• Codeforces Round #681 (Div. 2, based on VK Cup 2019-2020 - Final) 个人题解（A - D）
• Codeforces Round #679 (Div. 2, based on Technocup 2021 Elimination Round 1) (个人题解）
• Codeforces Round #676 (Div. 2) A - D个人题解（E题待补）
• Codeforces Round #671 (Div. 2) (A - B、D1题）
• Codeforces Round #670 (Div. 2) 深夜掉分（A - C题补题）
• Codeforces Round #669 (Div. 2) A、B题题解
• Codeforces Round #704 (Div. 2) A~E
• Codeforces Round #665 (Div. 2) A - D题题解
• Codeforces Round #664 题解（A ~ C)
• Codeforces Round #663 (Div. 2) (A~C题，C题 Good)
• Codeforces Round #658 (Div. 2)
• Codeforces Round #654 (Div. 2)
• Codeforces Round #645 (Div. 2)
• Codeforces Round #623 (Div. 2) A~D题，D题multiset使用
• Codeforces Round #620 (Div. 2)
• Codeforces Round #619 (Div. 2)A-D
• Codeforces Round #427 (Div. 2) (A~C)
• Codeforces Round #722 (这场难，需要注意)
• Codeforces Round #738 (Div. 2)
• Codeforces Round #736 (Div. 2) A~D
• Codeforces Round #733 (Div. 1 Div. 2, based on VK Cup 2021 - Elimination (Engine))
• Codeforces Round #732 (Div. 2) 思维场
• Codeforces Round #730 (Div. 2)
• Codeforces Round #728 (Div. 2)
• Codeforces Round #727 (Div. 2)
• Codeforces Round #726 (Div. 2)
• Deltix Round, Spring 2021 (open for everyone, rated, Div. 1 Div. 2)
• Codeforces Round #723 (Div. 2) （C题反悔贪心！！！）
• Codeforces Round #741 (Div. 2)
• Codeforces Round #721 (Div. 2) AB思维，B2博弈，C题map
• Codeforces Round #717 (Div. 2) 个人题解 Ａ～C （A思維，B位運算，C背包DP）
• Codeforces Round #716 (Div. 2) A ~ D 个人题解
• Codeforces Round #715 (Div. 2) (A~D 补题记录)
• Codeforces Round #714 (Div. 2) Divide by Zero 2021 个人补题记录
• Codeforces Round #712 (Div. 2) 个人题解
• Codeforces Round #711 (Div. 2) CodeCraft-21 A~C 个人题解
• Codeforces Round #708 (Div. 2)
• Codeforces Round #707 (Div. 2, based on Moscow Open Olympiad in Informatics Editorial
• Codeforces Round #706 Editorial