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.
Please update the problemset
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.