wangmarui's blog

Leave your favourite problems rating between [1600,2600]!
By wangmarui, history, 7 weeks ago, In English

I can't find many nice problems, so please drop some problems even if it's naive!

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7 weeks ago, # |
  Vote: I like it +14 Vote: I do not like it

Maybe this would be helpful :)

https://codeforces.me/blog/entry/134747

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    7 weeks ago, # ^ |
      Vote: I like it +5 Vote: I do not like it

    thanks :)

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    7 weeks ago, # ^ |
      Vote: I like it 0 Vote: I do not like it

    So why are these to articles so simlar?

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      7 weeks ago, # ^ |
        Vote: I like it +8 Vote: I do not like it

      Sorry, my English skills are too bad，so I have to copy others.

      The difficulty of problems that I acquire is not same to that post.

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        7 weeks ago, # ^ |
          Vote: I like it 0 Vote: I do not like it

        But that's not the reason to copy others.

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          7 weeks ago, # ^ |
            Vote: I like it +3 Vote: I do not like it

          You're right, but I have already obtained the consent of the original author.

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            7 weeks ago, # ^ |
              Vote: I like it -9 Vote: I do not like it

            Prove it.

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              7 weeks ago, # ^ |
                Vote: I like it +4 Vote: I do not like it

              Well, he is my friend, so I won't mind it:)

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7 weeks ago, # |
  Vote: I like it +6 Vote: I do not like it

https://codeforces.me/contest/2001/problem/E1

A simple DP, I nearly solved it during the contest.

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7 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

https://codeforces.me/problemset/problem/1916/D

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7 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

https://codeforces.me/contest/1770/problem/C

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7 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

1921E - Eat the Chip

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7 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

https://codeforces.me/contest/1841/problem/C not favorite though but it's a good problem ig.

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7 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

https://codeforces.me/contest/1559/problem/D2 , This one is a really nice problem and there is a really nice approach using two pointers in the comments

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7 weeks ago, # |
  Vote: I like it +11 Vote: I do not like it

I would like to recommend some problems:

1097F - Alex and a TV Show

627D - Preorder Test

1657F - Words on Tree

1292D - Chaotic V. — This one is actually 2700 but I recommend it because of the quite easy approach using virtual tree.

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7 weeks ago, # |
← Rev. 2   Vote: I like it +3 Vote: I do not like it

i leave this in almost every similar post,

1714F - Build a Tree and That Is It,

also here are some good graph/trees problems:

graphs
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7 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

https://codeforces.me/problemset/problem/718/C a nice segment tree problem

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7 weeks ago, # |
  Vote: I like it +11 Vote: I do not like it

This problem managed to make me enjoy segment tree shenanigans

446C - DZY Loves Fibonacci Numbers

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7 weeks ago, # |
  Vote: I like it +3 Vote: I do not like it

1503C - Travelling Salesman Problem

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7 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

1977C — Nikita and LCM

I think it is a nice problem.

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7 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

1776J — Italian data centers

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7 weeks ago, # |
  Vote: I like it 0 Vote: I do not like it

It would be good if you do something like a public google sheet where you put the problems the you are collecting from the comments section. btw, here is a problem that uses a well-known idea, so I think it's good to keep it in mind.

https://codeforces.me/contest/1996/problem/F

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