We will hold Daiwa Securities Co. Ltd. Programming Contest 2022 Autumn (AtCoder Beginner Contest 277).
- Contest URL: https://atcoder.jp/contests/abc277
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20221112T2100&p1=248
- Duration: 100 minutes
- Number of Tasks: 8
- Writer: leaf1415, cn449, physics0523, kyopro_friends, Nyaan
- Tester: kyopro_friends, math957963
- Rated range: ~ 1999
The point values will be 100-200-300-400-500-500-600-600. We are looking forward to your participation!
Ex is an easier version of this problem
graph round?
Graph Forces
I feel that virtual participation at codeforces really helps a lot. I was lucky to get F solved since I have met this problem https://codeforces.com/contest/587/problem/D, which is related to 2-sat, and by introducing some auxiliary nodes, the number of edges could be reduced from O(m^2) to O(m). I don't think I could solve F without this inspiration.
My submission for problem D that got AC during contest is actually wrong. I submitted just now to see if any "after contest" test cases have been added. None have been added and it still gets AC.
I suggest there should be a hacking mechanism through which we can add such cases.
Here is the test case which my submission fails. Correct answer should be 22, mine prints 26.
0 ≤ Ai < M
Your input does not follow the above constraint.