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Codeforces Round #585 (Div. 2) D. Ticket Game

Codeforces Round #586 (Div. 1 + Div. 2) B. Multiplication Table

Educational Codeforces Round 73 (Rated for Div. 2) B. Knights(构造)

Educational Codeforces Round 73 (Rated for Div. 2) A. 2048 Game

Codeforces Round #587 (Div. 3) C. White Sheet

Codeforces Round #588 (Div. 2) E. Kamil and Making a Stream(DFS)

Codeforces Round #588 (Div. 2) D. Marcin and Training Camp(思维)

Codeforces Round #588 (Div. 2) C. Anadi and Domino(思维)

Codeforces Round #589 (Div. 2) A. Distinct Digits

Codeforces Round #590 (Div. 3) C. Pipes

HDU-1078-FatMouse and Cheese(记忆化搜索)

LightOJ - 1173 - The Vindictive Coachf(DP)

LightOJ - 1322 - Worst Case Trie(DP)

LightOJ - 1318 - Strange Game(组合数）

LightOJ - 1246 - Colorful Board(DP)

Codeforces Round #603 (Div. 2) A. Sweet Problem(数学）

Codeforces Round #603 (Div. 2) B. PIN Codes

Codeforces Round #603 (Div. 2) E. Editor（线段树）

Codeforces Round #603 (Div. 2) C. Everyone is a Winner! （数学）

Educational Codeforces Round 78 (Rated for Div. 2) D. Segment Tree