INOI 2018 discussion

general
1

How was INOI 2018? How much did u get? Also add ur scores to this spreadsheet. https://docs.google.com/spreadsheets/d/1FiLaqTJDSm8E30UQWegIsuaJtvvdLlYAoqXyZMzK2dM/edit#gid=0

2

I got 127 …
First one was a very easy dfs
I found the 2nd question hard and did 2 subtasks in it.

3

Solved the road trip and museum one. 100. Simple dfs.
Couldn’t solve the second one though. You?

4

anyone solved 1 with bfs??

5

What were the problems?

6

I solved the first one using BFS and got 100… For the second one I used prefix sums and got 12 points…

7

I kept getting Segmentation error and runtime error while solving the first question. When I decreased the changed the adj list from adj[1000005] to adj[1005], the code ran fine.

Did anyone else have this problem ?
Also, what was I doing wrong ?

8

can anyone tell how to do the second question two paths

9

For second one, The observation was that, we can take one path and calculate the total sum without a second path using dp[i][j][k] = min/max(dp[i-1][j][k], dp[i-1][j-1][k-1])+prefix_sum[i][j]. We calculate this two times, once for min and once for max and then we can use the prefix sum intuition to subtract min-dp from max-dp. It’s not clear enough here, but you might get an essence.

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10

so what would be the expected cutoff??

11

are the cut-offs different for 10th and below and 11th and 12th. I am in 9th and getting 100 what are my chances of getting into the TC.

12

Are there any chances that cut off for 10th and below will fall to 100

13

Oh boy , was the second problem hard to get a logic for then,in the center.Anyway I guess the first one was pretty easy ,just basic bfs (or if you prefer,DFS).The second one really took a lot of my time and still I could solve only the easiest subtast of it(the 3rd one only,k=0) and could actually also solve k=m-2 task if I had a little bit more time (enough to copy my code from ide to submit tab :frowning: ) Anyway I don’t think I would be able to qualify with a pretest score of 112 seeing these many people get more higher . Still hope the cutoff somehow comes out in my favour :stuck_out_tongue: .(btw I thought in inoi they don’t have scores based on class/grade in which the participants study in ,right?)

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14

I got 100 - solved the first question. I noticed the k=0 subtask way too late for the second one. I didn’t have time to implement it properly :confused:

I’m really hoping that the cutoff for 10 and below is 100, but seeing the number of people who’ve got a score >100, I doubt that’s going to happen :frowning:

15

Do anybody know when the results will be published??

16

The results will be mostly announced within 10 days of INOI…

17

Can someone please remind me what the subtasks of the problem Two Paths were, and how many points each of them was worth? Thanks…

18

Results are out INOI 2018, List of qualifiers - IARCS

20

Can someone share how they prepare for INOI and competitive programming in general

21

Can someone share problems statement?