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Codeforces
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Educational Codeforces Round 55(A-E,G)
11-29
Codeforces Round #522 (Div. 2) (A-E)
11-20
Codeforces Round #520 (Div. 2)（A-E）
11-18
Educational Codeforces Round 54 (A-F)
11-16
Codeforces Round #519 (A-F)
11-13