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Codeforces Educational Round 21
05-19
Codeforces Round 413 Division 2
05-12
UVA230
05-08
Codeforces Round 412 Division 2
05-08
ITSA 2016 桂冠賽 挑戰組 第五題
05-03
Codeforces Round 378 Div2 Problem C
11-01