Class 10th. 50 Marks.
Yes but I am a little weak in algorithms
Q2)
your answer for part b and c are correct (even I got the same)
but for part (a) i got 96
given n=6 & k=8 (Ti denotes train i, E-enter, L-leave)
first T1 enters(obviously)
now since k=8 we can have maximum of 4 more trains entering and leaving before T1 leaves
case 1:
4 trains(T2 to T5) enter and leave before T1 leaves,that is, fix the position of T1 as 5 in the output sequence:
there are 14 possible ways in which T2 to T5 occupy the first 4 positions in the output sequence(can be easily verified)
For each of these 14 ways,there is only 1 way in which T6 can occupy the sixth position(EL)
So, 14 x 1 = 14;
case 2:
3 trains(T2 to T4) enter and leave before T1 leaves,that is, fix the position of T1 as 4 in the output sequence:
there are 5 possible ways in which T2 to T4 occupy the first 3 positions in the output sequence(can be easily verified)
For each of these 5 ways,there are 2 ways in which T5 & T6 can occupy the 5th and 6th position(EELL and ELEL)
So, 5 x 2 = 10;
case 3:
2 trains(T2 , T3) enter and leave before T1 leaves,that is, fix the position of T1 as 3 in the output sequence:
there are 2 possible ways in which T2 & T3 occupy the first 2 positions in the output sequence
For each of these 2 ways,there are 5 ways in which T4 to T6 can occupy the last 3 positions.
So, 2 x 5 = 10;
case 4:
1 train(T2) enter and leave before T1 leaves,that is, fix the position of T1 as 2 in the output sequence:
there is only one possible way in which T2 occupies the first position in the output sequence
For this one way,there are 14 ways in which T3 to T6 can occupy the last 4 positions.
So, 1 x 14 = 14;
So far total output sequences generated: 14+10+10+14=48;
case 5:
zero trains enter and before T1 leaves,that is, fix the position of T1 as 1 in the output sequence:
now again we have 5 more trains(T2 to T6) which have 48 output sequences as shown above.
hence total no. of output sequences = 48x2 = 96;
ANS:96
In the comment section of the first answer posted on this question this exists lists of E/L sequences as well as final sequences. Can you find the missing cases ? It will be easier to disprove the agreed upon ans that way.
I am getting 50. Grade 10. Can i be selected with this much . made a silly mistake , else would have got 60
The answer for case 5 is 42, not 48. The sum of previous cases is not equal to the last case, it needs to be calculated separately.
It is unlikely that cutoff for 10th will be more than 40.
some of your output sequences are not possible
ex:
452316
523416
524316
532416
534216
for case 5
now you have T2 to T6 instead of T1 to T5 and rest is the same
even though u calculate separately u will again repeat cases 1 to 4 and hence the count is 48 only.
What is expected cut off for class 11?
Last year in class 10 my score was 40 and class 10 cut off was 25 and 11 cut off was 30.
This year my score is 35
I got the exact same answers as you! Iâm in class 9 BTWâŚ
I solved problems 1, 3 and 4 correctly (and completely)! Iâm getting 60!!
On one hand I am extremely happy that you have secured 60 being in class 9 and on the other hand I am getting depressed that I might not get selected. You will get selected surely so start preparing for INOI immediately.
Oh! What happened?! How many marks are you getting? What grade are you in?
I hope you get through anywayâŚ
Grade 12 and 50 marks. I am also giving ZCO so I should definitely get through.
Hi all!
Iâm in 9th grade and I scored 60 in ZIO according to these answers.
I hope I get qualified for the NEXT LEVEL.
I am quite comfortable coding using Python and Javascript and am considerably proficient at HTML/CSS.
I have no experience in C, C++ and Pascal but I have very little experience doing with Java (or Oak as I think it should rightfully be called).
Iâm planning to go ahead and use Java for INOI. In order to do so, I have to learn Java within the next 2 months.
I want to have enough expertise to be able to solve the INOI problems so um⌠Does anybody have any suggestions as to how to learn Java? (I notice the redundancy)
You got 50 right? I think that youâll easily get selected.
Anyway, Good luck for ZCO!
I suggest you shift to C++ immediately. Its easier and most people use C++ so youâll be at an advantage when you have doubts and such. Because you havenât started itâll be easy for you. There are plenty of online resources for c++. Youâll have to hop from one to another because you have 2 months to prepare. Do selected topics and do them well. Dynamic Programming, BFS, DFS are topics you should be proficient with within the next 20-25 days. Good Luck!
I second Organic-Shilling, most people use C++ so itâll be easier for you to ask for help as well, and it doesnât make much of a difference right now since itâs not like youâve already started with Java and you have to switch,
Also, note that you only need to know the basic topics listed here: http://www.iarcs.org.in/inoi/online-study-material/topics/
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Hey!
According to your solutions, I would get 50 Marks and I am in Class 11. Will I make it through? Anyway, Thanks for posting the answers and also for the discussions! If I pass the cut-off, what should be my preparations for the next level? I have been learning C++ in my school for this year. Would that be enough? Cause, I donât even know what Brute-Force algorithm is! And I seriously think I am under prepared for this.
Btw, for the third part of the last question, I got it as 11. I donât know how I got that wrong.