Links: AP
April 5
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2009 multiple choice, 35 questions in 41 mins
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Got 26/34, 76%
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Gotta brush up on sorting, and remember the little nitpicks of java
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RECURSION NNNN
April 6
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44:30 minutes
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8, 9, 12, 14.5 minutes respectively, 8, 5, 9, 7 points respectively
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(1.b) Jan 1 returns 1, so there should have been a -1 to counteract it to make it work as intended
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Gotta think about that stuff a bit more
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(2) the thought of a variable for the number of days, including those that aren’t active
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I should’ve picked up on it since the user was adding steps even if it wasn’t considered an active day
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(4.a) forgot to assign the number of rows and columns for the 2d array
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4.b) traversed the row given rather than column, used col as limit instead of the length of lights (lights[0].length)
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rowLength = array.length;
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colLength = array[0].length;
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Not bad considering I hadn’t touched the language in a while, #2 was scuffed since I forgot to consider an instance variable that should be recorded, which cost me 4 marks lmao. The concepts they ask are super easy, so I might just re-read the notes I took and then keep doing free response questions until I get 100%, then I’ll do mcq until the week prior to the exam where I do free response questions every other day. Only problem is that there aren’t many mcq practice questions :/
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Daily frq until 100%
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Do all the multiple choice I can find
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Do at least 2 practice frqs before exam (6th, 7th)
April 7
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55 minutes
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9.75, 11.3, 10.25, 23 respectively, 9, 5, 7, 3 respectively
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24/36, 66% alaskdjflk;sajfsalk;fj
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(2.a) I still need to initialize arraylists (
arrayList = new ArrayList<Object>()) -
Faulty logic on storing pairs
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First for loop should be -1 since the last string will be already included through previous iterations
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Last loop should be i+1 to prevent duplicates
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Forgot to create the word pair object to put in the arraylist lul
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(3) Forgot to include “implements StringChecker”, forgot private prefix on instance variables
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(4.a) Assumed that it was not necessary to declare the size of the arrays
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Used array.add() which doesn’t even exist
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Array[r] = array2D[r][c];
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(4.b) Used redundant code to find first row, when all i had to do was square[0]
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Used square[0].length to find length of row, oops
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I think I was being overconfident yesterday, should continue to keep doing practice frqs
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Spend time reviewing CS notes before I take my next exam
April 8
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56 minutes
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11, 6.5, 19, 20 mins respectively, 6, 9, 8, 8 points respectively
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31/36 = 86%, with reference sheet would have been 33/36 = 91% :(
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(1.a) Forgot to initialize instance variable in constructor again…
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digitList = new ArrayList<Integer>(); -
Had incorrect parameter order for arrayList.add()
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Index first, then item
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(2) Nothing wrong, but when in doubt, implement it out
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(3.a) Returned a value when the function was directly changing the instance variable lul
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Shouldn’t happen if I pay attention to the function header
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(4.a) forgot to include the row and column of a 2d array
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I think I forgot to include it again when I transplanted my code
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Not bad, I kind of want to be faster though
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I’ll be sure to reference the reference sheet in future practices
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Just gotta keep doing more practice quizzes to remember the little nitpicks of java
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Remember to initialize instance variables in constructors
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I think I’m gonna take a break from doing frqs for a week or two, and I can pick them up and start reviewing the book then since i still have a whole month before the test
May 10
May 11
May 12
May 13
May 14
Progress
- Spent some time doing mc AP CS questions on runestone textbook, 33/45 (73%) correct in 53 minutes
- Finished part chap 3 question 15
- Could be better if I used all my time efficiently
- Gotta work on managing time since I won’t be able to go back
- Be so good I don’t need it all
Mistakes
C1
- combined for loops should be multipled
- arraylist should have Integer instead of int
- rushed guessing for the output of a loop
- ended at length-1 but the loop printed the value of the counter+1 so it would have reached the end
- tricky and new array alteration question, I can see where I went wrong though
C2
- Forgot what a binary search was and how to calculate the amount of iterations needed
- Thought a while loop would be able to fill a 2d array lul
- misread comparison sign…
- got tricked by if else recursive
- print only got called if no recursion, so only the end would be called
- Stupid click for demorgans law question, forgot to account for and/or conversion
C3
- Messed up an array altering line wtf
- assumed set didnt remove previous value oops
- Lost with binary searching
- Thought mid was a new int value, not the index spot
- you can’t set instance variables of a super class without using constructor
May 16
C4
- Weird instruction, two times a variable was set and it was asking for the one I didn’t think of
- fibonacci wack
- Bruh i could have just calculated it with my hand…
- I was thinking of sums for some reason??????????
- Thought an answer was wrong because count increased before operation, but count wasnt even part of the operation…
- I need to go over subclasses in classes
- Decided to guess a bin search for some reason
- Trolling in recursive return checking
- Forgot about insertion sort
- Goes by index to see if it can be moved
C5
- if there are no brackets, having the left of an or will result in true
- These questions need better wording ngl
- Making me tilt and just guess
- Didn’t bother to acknowledge the r<c
- Yo they don’t even know their exponent rules..
- If you call a super class method and the method called has a function in the object class, it will refer to that
- Forgot to run loop one more tiome emememem
- Messed up substring thing