[Codeforces] Round 1013(Div.3) Review(A~E)

https://codeforces.com/contest/2091 I solved 4 problems(A, B, C, D), and upsolved 1 problems(E). A - Olympiad Date (greedy, implementation) I was spend 10 minutes! because of a simple mistake. Setting up frequencies wrong make me struggle.. even if i...