Tag: 模拟
Codeforces Round 197 (Div. 2)
Codeforces Round 172 (Div. 2)
Topcoder SRM 572 (Div.2)
Codeforces Round 171 (Div. 2)
TCO 2013 Round 1B DIV1
Codeforces Round 170 (Div. 2)
Codeforces Round 168 (Div. 2)