Matjaz's blog

The best Codeforces problems
By Matjaz, history, 8 years ago, In English

There are lots of problems on Codeforces — and most of them will never be seen by most users of the site.

Share a problem you think more people should know about!

(It can be because it's fun, educational, interesting or any other reason.)

  • Vote: I like it
  • +51
  • Vote: I do not like it

Comments Comments (16)
| Write comment?
»
8 years ago, # |
  Vote: I like it +23 Vote: I do not like it

276C

Spoiler
→ Reply
»
8 years ago, # |
  Vote: I like it -6 Vote: I do not like it

733C

Spoiler
→ Reply
»
8 years ago, # |
  Vote: I like it +8 Vote: I do not like it

P1, P2, P3, P4

→ Reply
»
8 years ago, # |
  Vote: I like it +16 Vote: I do not like it

706E - Working routine

Spoiler
→ Reply
  • »
    »
    11 months ago, # ^ |
      Vote: I like it +3 Vote: I do not like it

    What I love about this is that it can only be solved for a 2D matrix, and not if it was an array of size $$$10^5$$$.

    So in a sense, there is no easy 1D variant of the problem.

    → Reply
»
8 years ago, # |
  Vote: I like it +3 Vote: I do not like it

441E — Valera and Number

429C — Guess the Tree

755G — PolandBall and Many Other Balls

→ Reply
»
8 years ago, # |
← Rev. 3   Vote: I like it -7 Vote: I do not like it

86D

Spoiler

321E

Spoiler

617E

Spoiler
→ Reply
»
8 years ago, # |
  Vote: I like it +3 Vote: I do not like it

http://mirror.codeforces.com/contest/705/problem/C

Spoiler
→ Reply
»
4 years ago, # |
← Rev. 2   Vote: I like it +6 Vote: I do not like it

484D - Kindergarten

Spoiler
→ Reply
»
4 years ago, # |
  Vote: I like it 0 Vote: I do not like it

903D - Almost Difference

→ Reply
»
15 months ago, # |
  Vote: I like it -8 Vote: I do not like it

1864C - Divisor Chain

→ Reply
»
7 months ago, # |
  Vote: I like it -10 Vote: I do not like it

780B - The Meeting Place Cannot Be Changed

Spoiler
→ Reply