Who felt that the question(A) that came in Codeforces Round #828 (Div. 3) was a little trickier/harder than the problem that came in Educational Codeforces Round 137 (Rated for Div. 2). I am writing this because for the first time I was able to solve the Div -2 problem A during the contest and I was not able to solve the problem A that came in Div-3, but was able to solve the problem-B (Div-3) but not during the contest, because my code for problem-B was throwing TLE on test case 5 during the contest.
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Codeforces (c) Copyright 2010-2024 Mike Mirzayanov
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Div3 A, Div3 B, and Div2 A are all usually around 800 rated difficulty. Naturally some will be harder for you if you haven't seen the idea before.