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Codeforces Round 413 Division 2
05-12
Codeforces Round 411 Division 2
05-07
ITSA 2016 桂冠賽 挑戰組 第五題
05-03
Codeforces Round 410 Div2 Problem C
04-27
POJ3104
03-24
Codeforces Round 284 Div2 Problem C
01-17
Codeforces Round 368 Div2 Problem C
08-21
Codeforces Educational Round 9 Problem D
08-19
UVa 11300
08-09
Codeforces Round 364 Div2 Problem D
08-04