Saturday, September 23, 2023
Sunday, September 10, 2023
On the surface, it might have seemed that making last season's winner USA1 even stronger would be impossible, but they have found a way, demolishing the field in just over three hours with Gennady on the team. Well done!
It would be nice to gather Petr Team again to participate, but given that the number of stages in a year is ~2x that of the Open Cup, with a stage is happening almost every weekend, the time commitment required to feel a real part of the proceedings would be way too big. We should try to do a one-off round some time, though :)problems, results, top 5 on the left, analysis, discussion). Quite fittingly, the first two places in the round went to the problemsetter (well, well) and the winner of AWTF. Congratulations to both!the last week's summary, I have mentioned a Codeforces problem: you are given an array of at most 10000 integers, each between 0 and 260. In one operation, you split the array in the middle into two parts, compute the bitwise xor of each part, and discard the part where the bitwise xor is smaller. In case they are equal, you may discard either part. After doing this operation several times, you have just one number remaining. Which positions in the initial array could this number correspond to?
Saturday, September 9, 2023
The overall top 3 solved non-intersecting sets of problems today, and it worked out the best for jiangly who combined the first place on day 2 with the second place on day 1 to win the event. Huge congratulations to him, ksun48 and tourist!
In a search for external factors that prevented myself from doing better, I've noticed that advancing to the finals from the 2021 season was the most correlated with the final results: the 2021 finalists got places 1,2,3,4,6,7,8 and 14. Maybe the problems for the finals were mostly prepared at the same time as the problems for the AGCs from 2021, and therefore require similar solving approaches? Unfortunately I have advanced in all other years, but not in 2021, hence the poor performance ;) Well done peti1234 for bucking the trend and winning the 5th place!
Huge thanks to the AtCoder organizing team for the amazing event, and to the problemsetters and testers for the problems! I have also enjoyed the social part immensely, meeting some old friends and getting to know new ones. I hope to meet you all again at some other competition in the future!
Thanks for reading, and check back tomorrow for this week's summary where I will also choose some AWTF problems to highlight.
Friday, September 8, 2023
Wednesday, September 6, 2023
So, maybe people with experience of Tokyo winds can share: how bad can it be?
In general, my approach to this trip is to avoid jetlag by living more or less on Swiss time. The contests start at 6:00 Zurich time, which is definitely early, but not outrageously so. Given that I'm here for just 4 days, it seems logical to not bother shifting the schedule by much, and to sleep 20:00-5:00 Swiss time (=3:00-12:00 here).
One of the benefits is that I get to do sightseeing in the evening, when it is much more pleasant outside, and there are less people everywhere. The flip side of this coin is that many places will be closed at night.
One particularly important challenge is getting food. Lunch happens during dinner time here, so it is not really an issue. I will be late for the hotel breakfast, but it will already be lunchtime, which means that I can get some lunch food in one of the cafes near the Shinjuku station (not sure if the lunch in the hotel restaurants will be quick enough to be in time for the contests). However, what to do about dinner? Any suggestions about where to eat in Tokyo at 1am? Bonus points if your suggestion comes in the next 2 hours ;)