Please help with kotlin!

Question

I'm reading a .txt file and saving it in a list

The list looks something like this:
2012 1 10.30
2012 2 6.00
2012 3 17.45
.
.
.
2019 1 11.45

Basically, it's a list of months and spending for each month. Now I want to calculate the year with the highest spending and the lowest spending.

How would I go about doing this, I have tried to do a for loop that compares year[i]==year[i+1] and if true adds spend[i] to total spends but this doesn't work as I get an indexOutOfBounds exception.

Thank you for any help in advance!

Answer 1

acc is the accumulator which is the spending in ur case. e is the element. in this case one line if your file.
Additionally we have a rule of how to accumulate.

Answer 2

MichaelS I am still learner too.
It was a pleasant challenge for me.

Answer 3

https://code.sololearn.com/cavxl3FDCbKh/?ref=app

Answer 4

https://code.sololearn.com/cNNhxjGtq934/?ref=app

Answer 5

Oma Falk I appreciate all the help, Thank you!

Answer 6

Oma Falk would this work if my list isn't hard coded in? I'm making my list by reading a file and using a loop. So can I do var spend = mutableListOf() and then do spend.add(year, month, spend) to make the list?

Answer 7

MichaelS yes
but maybe spend.add(listOf (year, month, spend))

Answer 8

Oma Falk unfortunately this gives and error

Answer 9

can u show ur orig please?

Answer 10

wait...since we add, spend must be a mutable List!

Answer 11

https://code.sololearn.com/cuB73I9FWm2x/?ref=app

Answer 12

Oma Falk I'm not sure if that's what I was meant to do. However, I don't understand the error

Answer 13

Kotlin could not infer the type of list elements because spend was an empty list.
In this case we have to specify it like I did.

Answer 14

Oma Falk just for learning purposes what is the "acc" and "e" in the acc, e->acc+e[2] the represent?