I wouldn't say it's safe, but forn≤2×105n≤2×105it's quite unlikely to be hacked. With a bit largernn(like5×1055×105) it's more likely to have quite a bad case. If you're interested,https://codeforces.com/
Hack: https://codeforces.com/contest/2000/hacks/1069602 3. Visiting in order of node number This also happens a lot because many people use std::pair of each (node,distance)(node,distance) in priority_queue. Because the comparator of std::pair compares first first, by default the node wi...
I was a Chemistry major student in high school, and only came towards competitive programming in college days. However, using perspectives from an environment to expect at another, I can guarantee you will have to experience the frustration you seemingly just expressed. Codeforces isn't any OI ...
so I decided to write a blog that has all important information about how to use Codeforces in a single place. I will update it with time, so feel free to write your suggestions/questions in case I missed something and I will be glad to add it to the post!
Hi Codeforces! In Round 507 earlier today, a large number of "mostly correct" randomized solutions on1039B - Subway Pursuitwere hacked. I wanted to write a quick explanation of how it's possible to hack these, as well as a guide on how to write your code so that you aren't vulnerable...
so the best way is to AC 1 problem and Hack Failed for many times. If you are sure you can make a code that could Failed System Test at that problem, then do it. If you want to do, you can use some trick to Hack Failed as quickly as possible, but if you are Skipped or repor...
With C++11, we finally received a hash set and hash map in std::unordered_set and std::unordered_map. Unfortunately, I've seen a lot of people on Codeforces get hacked or fail system tests when using these. In this post I'll explain how it's possible to break these data structures ...
I summarized why I think Rust is suitable for contests in 2019 onward. Granted, the learning curve is substantial enough that it may not seem that way at first. To make the transition easier, for anyone who's interested, here I'll go over some aspects of my Codeforces submissions in ...
some general rules. For this example, the aforementioned user would perform at least n*(n+1)/2 operations in worst case with n being at most 100 000 and time limit of 2 seconds. Was it reasonable to attempt to hack his solution and what is your approach with regard to the time ...
What is the complexity of my solution then? 2D BFS. Seems like O(N^2 + N^3) to me http://codeforces.com/contest/602/submission/14454922 →Reply pllk 9 years ago,#^| +5 I'm not sure about the time complexity of your code, but constant factors are important, too. Floyd-Warshall...