tanakh's blog

Codeforces Beta Round #3
By tanakh, 15 years ago, In English
A. Shortest path of the king

It is very easy problem, but I wrote wrong direction and got 1 WA. Kanashisu...

B. Lorry

It is very easy problem too, but I confused the output specification. There's no example that has multiple vehicles numbers of output. I got many WAs. I was sad. I submitted many solutions that make small changes. Eventually I found the other mistake.

C. Tic-tac-toe

It is very easy problem too, but I miss a situation that fast won and first's move and vice versa are illegal. What a pity!

D. Least Cost Bracket Sequence

I complete to implement a divide and conqueror algorithm after the end, but I got TLE. I don't know a collect algorithm yet...
  • Vote: I like it
  • +1
  • Vote: I do not like it

15 years ago, # |
  Vote: I like it 0 Vote: I do not like it
Hello. Tanakh-san. I saw your tweet. Nice to meet you here. Is this another contest site, like Topcoder? Then I want to join here too! Language skill (Programming && English) is very important for me and you! Let's Keep Challenging!
→ Reply
  • 15 years ago, # ^ |
      Vote: I like it 0 Vote: I do not like it
    This is like topcoder, but it is similar to ICPC than topcoder. Problems need little bit heavy implementation, and you allow to get many many times of WAs! Let's join here!
    → Reply
15 years ago, # |
  Vote: I like it 0 Vote: I do not like it
For problem D - I tried to solve it with Dynamic programming - it's time complexity is O(N^2), but with a very low constant (optimised it very heavily), but still got TLE. Just curious, what time complexity has your divide and conquer solution?
→ Reply
15 years ago, # |
  Vote: I like it 0 Vote: I do not like it
I thought my algorithm works with O(nlogn), but it is misconception. It's complexity really is O(n^2logn).
→ Reply