Comments
+11

In Div1D, the maximum size of a connected component is $$$O(\sqrt n)$$$. But what's the exact upper bound of it? Theoretically, it's $$$\sqrt{3n}\approx 774$$$, but my submission, where I suppose it doesn't exceed 400, got accepted. Can anyone prove it or hack it?
On Vladosiya → Hashing root trees, 3 years ago
+31

There's a way to hash rooted trees which has a better time complexity and is also easy to implement, whose expected number of collisions doesn't exceed $$$O(\frac{n^2}{2^w})$$$. It is mentioned here.

To avoid being hacked, you can use random parameter instead of 1237123 in the article when solving Codeforces problems.
+10

concrete mathematics
+32

In my opinion, there aren't any platforms more preferable for practicing than codeforces. Just keep solving problems on codeforces and you will perform better in the contests. Many of my friends have made great progress by solving a number of problems on cf. You can see when I started competed on cf, I ranked 4000+ just like you, but now I'm red.
-121

Although I heard some netizens say, and I also think whether Codeforces is blocked or not doesn't matter to many codeforces users, I think after all using websites not blocked is more convenient.
-87

However, according to some netizens in the QQ group Universal OJ Users, almost everyone in China mainland who use Codeforces can across the Great Firewall

But anyway, I don't think any political content posted on codeforces is appropirate because codeforces is a website for people who love programming. I think whether it will make codeforces blocked or not it's not good to post content which is not about algorithms on codeforces
On sshwyR → Codeforces Round #664, 6 years ago
0

How to prove that the function is unimodal in Div1C(Div2F)?

Thanks
0

I can't understand what 'even length square sub-matrix' means in problem D.

Does it mean a sub-matrix with even width and even height?

Thanks

@SleepyShashwat
0

I want to know what my rating is before the rating change is released.
-11

I'd also like an exe or a cpp that can calculate the rating automatically for me.
+3

No.

But I'm lazy.

Could you recommend a stable one?
+1

Where is the editorial?

I'm a Chinese and it's difficult for me to watch the editorial videos on Youtube without vpn

Is there anybody warm-hearted who can put the editorial videos on websites that Chinese can visit without vpn?

Thanks