hugopm's blog

By hugopm, 4 weeks ago, In English,

Hello, Codeforces!

I'm glad to invite you to Codeforces Round #600 (Div. 2), which will be held on Nov/16/2019 17:35 (Moscow time). It will be rated for all participants with rating below 2100. You will be given six problems and two hours to solve them. As usual, the score distribution will be announced shortly before the round.

The problems were invented and prepared by me. Huge thanks to:

This is the first french round on Codeforces, I hope that everybody will enjoy it :) GL&HF to all!

UPD1: Scoring distrubtion is 500-1000-1500-1750-2250-2750

UPD2: Editorial is out

UPD3: Thanks for participating! Congratulations to the winners:

Div.1 (unofficial) participants

  1. Um_nik (solved all problems in 38 minutes!)
  2. dreamoon_love_AA
  3. mango_lassi
  4. imeimi
  5. cerberus97

Div.2 participants

  1. whyzker
  2. root_power_6
  3. SeranOZ
  4. AlineSH
  5. niro14

First solve

 
 
 
 
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4 weeks ago, # |
  Vote: I like it -34 Vote: I do not like it

Hope problem statements are short & strong pretests.And also best of luck for your first round.

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4 weeks ago, # |
Rev. 2   Vote: I like it -105 Vote: I do not like it

This is the first french round on CF, I hope that there won't be any DDOS attacks.

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4 weeks ago, # |
Rev. 2   Vote: I like it +153 Vote: I do not like it

I wish this will not happened

y3mqxi9bulm11.jpg

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

Unfortunately, right in the middle of the two contest days of CSP-S 2019

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4 weeks ago, # |
  Vote: I like it +84 Vote: I do not like it

How to learn the culture of other countries?

Google (×) Codeforeces (√)

"Bonne chance et bonne note!"

It is correct?

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    4 weeks ago, # ^ |
      Vote: I like it +34 Vote: I do not like it

    I think we would just say "Bonne chance !" in french. We don't add anything comparable to "wish you high ratings", it would be redudant :)

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    3 weeks ago, # ^ |
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    Ta tête est si mignonne. qwq

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4 weeks ago, # |
Rev. 2   Vote: I like it +24 Vote: I do not like it

Good luck to everyone in this round! Hope it will be unique and interesting (because it is anniversary).

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

martin&frederick instead of Alice&Bob :think:

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4 weeks ago, # |
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I hope your first contest will be my best ;) Good Luck to everyone

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4 weeks ago, # |
  Vote: I like it +9 Vote: I do not like it

Round clashes with COCI #2. Please do smth. I really don't want to skip either COCI or Round, where McDic is tester

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4 weeks ago, # |
Rev. 2   Vote: I like it +26 Vote: I do not like it

Bonjour à tous — Bonne chance

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4 weeks ago, # |
  Vote: I like it +36 Vote: I do not like it

baguette round :O

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4 weeks ago, # |
  Vote: I like it +167 Vote: I do not like it

Me: I haven't done a CF round in ages. I should do this one!

Also me: wait I tested this?

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4 weeks ago, # |
  Vote: I like it -13 Vote: I do not like it

You will not be lucky enough to see someone in No.1 spot in top rated list except tourist for long. Congratulations ! Benq.

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4 weeks ago, # |
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Everyone knows I only test the best rounds

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4 weeks ago, # |
  Vote: I like it +39 Vote: I do not like it

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3 weeks ago, # |
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Does it mean french statements? Or, does it mean problems made in France? :o

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    3 weeks ago, # ^ |
      Vote: I like it +89 Vote: I do not like it

    Problems made in France. Statements will be only available in english and russian, as usual.

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      3 weeks ago, # ^ |
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      Alright, thanks. I was afraid of french statements :o

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3 weeks ago, # |
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Upvote to become green

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    3 weeks ago, # ^ |
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    You're OneSubmitMan you should be legendary grandmaster all problems are accepted in one submit

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3 weeks ago, # |
Rev. 2   Vote: I like it -40 Vote: I do not like it

This will be my first contest by hugopm.Please, pray for me.

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3 weeks ago, # |
  Vote: I like it +2 Vote: I do not like it

As soon as I saw that the round would be french, I immediately thought of baguettes, berets, and french accordian music. Good luck on the round everyone!

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3 weeks ago, # |
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I hope the problem statements are short and clear.

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3 weeks ago, # |
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Score distribution?

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3 weeks ago, # |
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what is the penalty for wrong submission in this contest ? 50 or 10 points ?

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3 weeks ago, # |
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A well balanced contest! Thanks hugopm

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3 weeks ago, # |
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I'm not the only one who did Silly Mistakes :/ I forgot the most obvious case in B when the employee doesn't leave and as always forgot to handle long long in C

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    3 weeks ago, # ^ |
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    I did Silly Mistakes on both A and B =)

    declare 1005 elements of array when it actually has 100000 elements

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    3 weeks ago, # ^ |
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    My silly mistake in finding representative for sets — par[i] = par[par[i]] instead of par[i] = root(par[i])

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3 weeks ago, # |
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Segmentforces lol :D

Good round btw

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

Does d&c optimization not work for E? f[i][j] — minimum cost to cover prefix j considering first i elements. Here is the submission that works in n*m^2. The commented part and the recursion function is the d&c optimization.

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    3 weeks ago, # ^ |
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    Can you explain your idea a bit?

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    3 weeks ago, # ^ |
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    I don't think the dp was of the form where you can do divconq.

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      3 weeks ago, # ^ |
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      Well it looks like a recurrence that can be optimized by d&c but i don't think that the function is monotonous so you might be right.

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How to solve F?

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    3 weeks ago, # ^ |
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    1. Find distances between every two of centrals using Dijksta-like algo.

    2. After that sort all central-to-central distances.

    3. Construct DSU where for each component you maintain set of queries not yet answered.

    4. Then just merge distances from (2) in increasing order. Use small to large technique: and if query from small is present in large set that means that this merge is first moment when queries vertices is reachable one from another

    I was 2 minutes to slow to finish this in contest, so I'm waiting up-solving to submit. 65211806

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      3 weeks ago, # ^ |
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      lol, i first construct MST after dejkstra and then solve smth like max edge on tree path query problem. Didn't understood that i could have answers on constructing mst already

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    3 weeks ago, # ^ |
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    This might be super complex, but I think it works:

    1) Find minimum distance to every vertex from a vertex that has a station (Dijkstra), denote as d[v]

    2) Transform the graph, so that each edge has now cost c[u, v] = c0[u, v] + d[u] + d[v], where c0[u, v] is cost at the beginning

    3) Now each query is equivalent to — what is the heaviest edge on path in this graph between a and b.

    4) Find minimum spanning tree of this graph, and on that MST perform LCA to find heaviest edge from a to LCA(a, b) and b to LCA(a, b).

    I got RTE13, but I think it should do okay.

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      3 weeks ago, # ^ |
      Rev. 3   Vote: I like it +8 Vote: I do not like it

      I got lost on step 2. Why do we want the heaviest edge between a and b after the transformation? Also, what was the intuition behind the transformation?

      EDIT: I misread your step 1. Thought you chose an arbitrary central. Nice solution!

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3 weeks ago, # |
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If I pass pretests, then brilliant round!

Or else, still brilliant round!

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3 weeks ago, # |
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Is E a straight-forward dp? I thought it was easy, but I keep WAing on pretest 5.

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    3 weeks ago, # ^ |
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    If $$$x_i < x_j$$$, you only extend $$$x_i$$$ enough to cover the uncovered left part because it's always better to cover the right part with $$$x_j$$$.

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3 weeks ago, # |
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What was test case 6 in D? :(

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How to solve D?

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    3 weeks ago, # ^ |
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    Use dsu Find min and max in every component, save these as segments, sort them If seg[i] crosses seg[i -1] then combine them and ans++

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      3 weeks ago, # ^ |
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      How much crosses if one (or more) segment completly inside another? And why?

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        3 weeks ago, # ^ |
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        I also checked whether these two segments are connected now or not using dsu

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3 weeks ago, # |
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In problem D, I tried this approach: instead of finding the union-set of each element, store each disconnected component's max and min in a vector using dfs, sort the vector by min elements, then no. of segments (found using the above sorted vector by normal traversal) which are intersecting is the answer.

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    3 weeks ago, # ^ |
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    how do we find intersecting segments.?

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      3 weeks ago, # ^ |
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      considering you have above vector<pair<int, int>> x, and:

      • x.first = min_ element of each disconnected component.
      • x.second = max_ elemtent of that component.
          sort(x.begin(), x.end());
          max_ = x[0].second;
          for(int i=1; i<x.size(); i++){
              if(x[i].first < max_){
                  cnt++;
              }
              max_ = max(max_, x[i].second);
          }
          return count;
      
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    3 weeks ago, # ^ |
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    I made the same idea, I hope this idea pass the system test

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How to solve D? is it union find?

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    3 weeks ago, # ^ |
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    i got TLE using union find

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    3 weeks ago, # ^ |
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    It is somehow about counting the components and count the missing connections between them. Still not fully sure about which ones to connect to each other.

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      3 weeks ago, # ^ |
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      I guess each connected component must have all consecutive vertices. If not, you must connect it to another component that has that vertice. I tried this using DSU and got TLE, and then WA.

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    3 weeks ago, # ^ |
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    me too. but i thought it is because of python

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    3 weeks ago, # ^ |
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    3 weeks ago, # ^ |
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    It is, you can check my solution.

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    3 weeks ago, # ^ |
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    Do DFS from 1 to N for every currently unvisited node and store the maximum visited node so far. Before doing DFS if the maximum visited node is greater than this unvisited node that means u need to connect these components, and hence increase answer by 1.

    Spoiler
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      3 weeks ago, # ^ |
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      Thats by far the most nice solution to this problem I have seen, thanks.

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      3 weeks ago, # ^ |
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      Thanks, this is a cool idea! I missed it completely :(

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    3 weeks ago, # ^ |
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    OK. I knew what i did wrong. i had to check duplicated visits :(

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    3 weeks ago, # ^ |
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    Yea union find worked for me.

    Edit. But now that I think about it — simple dfs or bfs would be enough for me.

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    3 weeks ago, # ^ |
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    Process the connected components (either bfs, dfs or union find) and identify the max element for each component. Then check for each element 1 through n what component it belongs to and the max of this component. If you see an element of a different component and you haven't reached the max, update the max and add 1 to the answer. $$$O(m+n)$$$ overall.

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3 weeks ago, # |
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3 weeks ago, # |
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graphforces

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3 weeks ago, # |
Rev. 2   Vote: I like it +4 Vote: I do not like it

My F idea:
just do parallel Dijkstra to find the nearest special node from all special nodes
and this is the distance you actually need
now your graph has k nodes only
and the edges of this graph have weights you found using parallel Dijkstra
now in this graph, do MST (minimal spanning tree)
and note the order in which you add the nodes (1 to k) in the MST
then use the order as the numbering of the nodes (renumber the nodes)
eg: if the nodes are added in the order 2 4 1 5 3 (k=5)
then the nodes 1-5 will be numbered 3 1 5 2 4
now rerun the MST algo with this new numbering
and answer the queries for each added node in the MST
as the answer for each query is nothing but the max edge weight in the new k-graph

Anyone knows if this can fail?

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3 weeks ago, # |
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3 weeks ago, # |
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Couldn't solve anything... feel so dumb atm... :'D

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    3 weeks ago, # ^ |
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    Eh, you're not the only one. I tried solving C as DP problem, tho i think the actual solution is easy :D

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So far, there isn't any comments on B.Ummmm......Don't you want to say something about it?

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    3 weeks ago, # ^ |
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    I don't know what is the corner case in test 13

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    3 weeks ago, # ^ |
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    I couldn't solve A and B. I think these problems with a specific implementation, where you have to be careful, but I, as it turned out, is not like that)

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    3 weeks ago, # ^ |
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    I shouldn't make such a comment. My B FST now......

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3 weeks ago, # |
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Worst Contest i ever had. trash A,B problems

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3 weeks ago, # |
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in Div2-B I did the same as tutorial but instead if the office is empty start a new day I didn't start a new day and continued the solution until I found someone who is already entered, I begin new day at this time.

what makes this solution fails on test 13 ?

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    3 weeks ago, # ^ |
    Rev. 3   Vote: I like it +19 Vote: I do not like it

    I'm guessing something like

    6
    1 -1 2 1 -1 -2
    

    would make it fail, as you end a day when 2 is still in the office.

    Trying to minimize the number of days like you're doing is actually something none of the testers thought about, hence the lack of pretest designed to make this solution fail. There will most likely be a lot of systests on that problem, and we sincerely apologize for that.

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      3 weeks ago, # ^ |
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      agh!!!. what a (Silly Mistake)

      Problem name is really describe my mistake!!

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      3 weeks ago, # ^ |
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      What is the answer to the test case? Is it -1 (or) 2 [2 4] ?

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        3 weeks ago, # ^ |
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        The latter is the correct answer.

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          3 weeks ago, # ^ |
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          Hmm, my code is printing the same but still FST.

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            3 weeks ago, # ^ |
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            Shit!. I did not check the condition that one can't leave without entering. Nice and strong pretest.

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      3 weeks ago, # ^ |
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      Can you please see what is wrong with my approach, the test 13 is big and i cannot make sense of it?

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      3 weeks ago, # ^ |
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      what if we check if the ones who entered already left when somone reenters above soltions should work..But it still fails on test 13. can someone help 65220901

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    3 weeks ago, # ^ |
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    Lol, I did same thing((( I think smth like this: 1 -1 2 1 -1 -2

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3 weeks ago, # |
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Thx 4 rlly fast testing and great pretests))

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3 weeks ago, # |
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I'm sorry for the unexceptedly high number of FSTs on B. It was the last problem added in the contest (between Single Push and Sweets Eating, in order to make the round more balanced) and we didn't come up with the incorrect greedy that tries to minimize the number of days :(

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3 weeks ago, # |
Rev. 2   Vote: I like it +33 Vote: I do not like it

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3 weeks ago, # |
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I miss this contest,but now I'm trying to solve the problems but it says you can't, you should register to submit your solution.

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3 weeks ago, # |
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Got FST in B WA 33 :/ Can anyone go through and tell what silly mistake did i do?

https://codeforces.com/contest/1253/submission/65188326

thanks

got it simple silly mistake

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3 weeks ago, # |
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Fastest editorial I've ever seen

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3 weeks ago, # |
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please what's wrong with my solution to B?

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3 weeks ago, # |
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Thanks hugopm !

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3 weeks ago, # |
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D was the easiest. This should not be like this

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Can someone tell me a cleaner approach for D using DSU . I did something like storing the minimum vertex in each component and if that component does not form a contiguous segment I start merging.

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3 weeks ago, # |
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I can relate with B's name .

Worst Mistakes I have done in a while (just missed both B and D).

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Can someone explain their idea for problem E using Segment tree?

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    3 weeks ago, # ^ |
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    The inner min query of DP transitions can be converted to segment tree, though it's unnecessary.

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    3 weeks ago, # ^ |
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    Create segtree of size m+1. You start index 0 with cost 0, and indices 1...m with cost inf. Then we iterate through each antenna i in increasing order of position. Now we iterate through all possible sizes j for antenna i, such that it reaches interval [i-j,i+j]. The cost, denoted by cst, for this interval is max(0,j-s_i). Now we add this interval in the following way: we find the min cost x on interval [i-j-1,i+j] and then set index i+j to cst+x. In this way, we are "extending" the configuration from [0,i-j-1] to [0,i+j]. Now answer is index m in segtree.

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Thanks hugopm for the round and congrats for reaching GM!

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My rating before the round: 2032 Expectation: +68 (Master) Reality: -68. Expectation + Reality = 0.

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3 weeks ago, # |
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I've did some Silly Mistakes in the problem B during the contest, but resolved after that. In C I can't think of a solution with complexity less than O(n^2), any tips or topics to study?

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    3 weeks ago, # ^ |
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    The solution to C involves dynamic programming. However, we must make some observations first.

    If you want to eat exactly $$$k$$$ sweets, it is optimal to always eat the ones that will result in the least sugar penalty. So, we will sort the sweets from lowest to highest sugar penalty, and for each possible $$$k$$$, we will eat the first $$$k$$$ candies in our sorted array.

    Next, we realize that the optimal way in which we eat these $$$k$$$ candies is to take as many as we can each day, starting from the largest ones. For example, if we had $$$k=5$$$ sweets from $$$(1, 2, 3, 4, 5, 6, 7)$$$ and can eat $$$m=2$$$ each day, we would eat $$$(5,4)$$$ on Day 1, $$$(3,2)$$$ on Day 2, and $$$(1)$$$ on Day 3.

    So there is our $$$O(n^2)$$$ approach! For each $$$k\leq n$$$, we greedily take sweets in this manner. To improve this to $$$O(n)$$$, we make some more observations about the patterns in these calculations. Let's consider the same example as above. For $$$k=5$$$, we have a minimum sugar penalty of $$$1(5+4)+2(3+2)+3(1)=22$$$. How about for $$$k=7$$$? Then we would have $$$1(7+6)+2(5+4)+3(3+2)+4(1)=50$$$, which looks suspiciously familiar...

    The expression for $$$k=7$$$ can be broken down into the result of $$$k=5$$$, plus the sum of first $$$7$$$ sweets. As a matter of fact, the result of any $$$k=i$$$ will be equal to the result of $$$k=i-m$$$ plus the sum of the first $$$k$$$ sweets in our array, as long as $$$i>m$$$. We can calculate the sum of the first $$$k$$$ sweets in constant time by using a prefix sum array. Let's store our results in an array called $$$dp$$$.

    Our transition is as follows:
    - for $$$i\leq m$$$, $$$dp[i]$$$ is simply the prefix sum of all elements up to and including $$$i$$$.
    - otherwise, $$$dp[i]=dp[i-m]$$$ plus the prefix sum of all elements up to an including $$$i$$$.

    I hope this helped! If not, the official editorial should help you get somewhere. Cheers!

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      3 weeks ago, # ^ |
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      Wow, it really helped me and was very didatic. Much obliged!

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3 weeks ago, # |
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For D, I thought of two questions:

(a) how many components are there at the beginning?

(b) how many components must be there after the operations?

then the answer is the difference (a)-(b).

(a) is a simple union-find. (b) is a Problem B when an edge (u, v) means an employee comes at time u and goes home at time v.

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Congratulation!!! root_power_6

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3 weeks ago, # |
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i am so weak , how to become strong? QAQ

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3 weeks ago, # |
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Can anyone please fix the tags for problem A? It seems that somebody had been spamming every single tag available on that problem.

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3 weeks ago, # |
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.

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

some people copy from ideone and pretend that they are smart.

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

why they didn't give ratings till now?