「Edu Codeforces Round」#134

「NowCoder Round X」#56

「NowCoder Round X」#55

「Codeforces Round」#816 (Div 2)

「Codeforces Round」#815 (Div 2)

「Codeforces Round」#805 (Div 3)

「Codeforces Round」#814 (Div 2)

「Codeforces Round」#813 (Div 2)

「NowCoder Round X」#54 题解

「Codeforces Round」#812 (Div 2)