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C. Differential Sorting || Codeforces Round #772 (Div. 2)

C - 1 2 1 3 1 2 1 || AtCoder Beginner Contest 247

D - Range Count Query || AtCoder Beginner Contest 248

D - Cylinder || AtCoder Beginner Contest 247

A - Enlarge GCD || Codeforces Round #511 (Div. 1)

A. Great Sequence || Codeforces Round #773 (Div. 1)

C. K-Complete Word

D - Message from Aliens (ATCODER)