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codeforces
Codeforces Round #770 (Div. 2) (A-D题解)
Educational Codeforces Round 122 (Rated for Div. 2) (A-D题解)
Codeforces Round #769 (Div. 2) (A-D题解)
Codeforces Round #768 (Div. 2) (A-D题解)
Educational Codeforces Round 121 (Rated for Div. 2) (A-C)题解
Codeforces Round #766 (Div. 2) (A-C) 题解
Codeforces Round #764 (Div. 3) (A-D)题解
Codeforces Round #765 (Div. 2) (A-C)题解
Codeforces Round #761 (Div. 2) (A-D1) 题解
Educational Codeforces Round 119 (Rated for Div. 2) (A/B/C/E) 题解