Please update the problemset

Revision en1, by int128., 2020-12-04 13:04:03

Codeforces Round #687 (Div. 1) was held at November 29, but 1456A, 1456B, 1456C, 1456D are still not in the problemset.

Please add these problems to the problemset.

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en1 English int128. 2020-12-04 13:04:03 247 Initial revision (published)