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IT'S YOU!!! CODEFORCES ROUND 1091 C!!!
IT'S NOT FUN AT ALL!!!
IT MADE ME SUFFER!!!
YOU DON'T NEED ANY ALGORITHMS FOR THIS!!!
YOU JUST NEED TO BE GOOD AT MATH — OR JUST GET LUCKY AND GUESS!!!
YOU MAY HAVE SPENT A LOT OF TIME TRYING TO PROVE IT, WHILE OTHERS JUST GUESSED THE SOLUTION!!!
The 'Raft' taught me: your heart will always find a way.
Hello, this is Whalica! I am pleased to present my second contest! Round 2 differs from Round 1 as I have invited many friends who love algorithm competitions to help set the problems. I hope you enjoy this contest!
Contest Link: Whalica Cup (Round 2)
Problem Setters: Whalica, mahiro_zcy, hosizora, XqAiyee, MaxBlazeIceInk
Problem Testers: WuHuaRou, tevi, et al.
Setters' Subjective Difficulty: Codeforces div3 ~ div2, Luogu difficulty does not exceed Advanced+/Provincial Selection- (Luogu difficulty color blue). The problems are sorted in ascending order according to the setters' subjective difficulty.
Number of Problems: 9
Contest Date: February 15, 2026
Contest Time: 14:00 — 18:00 (UTC+8)
Duration: 4 hours
Post-Contest Editorial: The official editorial is available as a PDF on Codeforces.
Previous Contests:
I just finished Codeforces Round 1065 (Div. 3), and it was a wake-up call. I couldn't solve either of the two constructive problems (E, F).
When I see a constructive problem, my mind goes blank. I start guessing patterns randomly, which never leads to a solution. It feels like I'm just supposed to magically "see" the answer, and I always fail to find a solid starting point. Before I know it, the time is gone.
How to improve my constructive skill? Any advice would be greatly appreciated. Feeling stuck.
I am a freshman in college and have just started learning how to participate in online programming competitions. I try my best to participate in all the competitions on CodeForces to improve my skills, but I have found that I can only solve one or two questions in many competitions, which has caused my rating to go up and down. My question is: How can I steadily improve my programming skills and ratings? I am seeking your assistance.
