!process anyone get loan offer c1 tech q

[remote wind]

what does loan offer mean

[peak cave]

it was one of the tech questions

[fathom sun]

it was like storing monthly balances & calculating a credit score to see which loan offer to provide right?

[peak cave]

yeah, but i got stuck on calculating age of accounts

like say input of dates is 01102012 03042013 … i might be a dumbass but if it was all same year it would be easy to calculate it
across multiple years was a bit more tricky and i didnt have much time
cus first u gotta find the oldest account and then compare to the current account
thats how i woulda done it but im sure theres an easier way
she also wouldnt tell me if age was in days months or yrs

[rain orchid]

me

[rain orchid]

my guy said it was only the months that there was a balance item for not the newest - oldest

[fathom sun]

split it and make it a list, and then index to find each part of the string, like [:2] would be day, it would be kinda messey with alot of if statements but it would find the oldest and newest

[peak cave]

yeah but then youd also have to calculate the age tho no?

like doable but def did not have enough time so im assuming there was supposed to be an easier way

[fathom sun]

yea and i think loan is the hardest one

cashback and fraud r much easier

[peak cave]

one of the things u had to calculate was account age, but interviewer wasnt being too clear on how to do so, she just kept saying something like we know that each month has a balance like ik that already 😭

yeah cashback and fraud i literally had memorized lmao

its wtv i think my case and behav went good so lets see

[fathom sun]

how precise were they asking the account age to be, was it like down to the day like, account is 1 year 2 months and 3 days old 😭

[peak cave]

was not specified

[fathom sun]

did you ask them?

[peak cave]

nah i was too focused on getting the oldest age

shoulda clarified earlier tho

[fathom sun]

yea they purposefully leave out information so that you have to ask for it

[peak cave]

yeah i was planning on asking but im p sure it was likely gonna be total months

technically the data set does go over multiple years tho

and each dataset was for one single customer

so would prolly have to do some weird math if ur tryna get total months from like jan 2012 to april 2015

[fathom sun]

damn, multi customers?!? the other questions were for a single customer

[peak cave]

nah its single customer, but their balances and payments span across multiple years

i was using MMYYYY for the key in my dict

since there was no ID

[fathom sun]

ah i see, and im guessing they asked how would you scale it to multi customers?

[peak cave]

yeah most likely

do yk if they look at which q they gave u when reviewing

or is it just an overall performance thing

cus ts was buns

[fathom sun]

i think its overall, case and tech r on a scale from 1 to 10, behave, is pass or fail

[peak cave]

gothca

well lets see

[fathom sun]

dw u got other processes too, so ur chilling

[rain orchid]

you got this

wagmi

[fathom sun]

thats only if there is a key for every MMYYY, there could be some months where there were no transtions

[fathom sun]

you think this would work?
you get each key (MMYYYY) as a tuple like (YYYY,MM) in a list, find the min and max of that list representing oldest and newest months, then calculate it using math
like (newest[0] - oldest[0]) * 12 + (newest[1] - oldest[1])

[peak cave]

this looks good, you just need to have enough time to be able to code all that up because you also need to find the oldest date first

which isnt hard but like others said a heap would be one way to do it

[fathom sun]

why not do this
min_date = min(date_array)
max_date = max(date_array)

Python compares tuples element-wise. For (YYYY, MM), it first compares the year (YYYY). If years are equal, it compares the month (MM). This aligns with chronological ordering: (2022, 12) < (2023, 5) < (2023, 8) < (2024, 1).

[peak cave]

ah yeah that would, for me though i used my dates as keys, and never made a new structure for it so i wasnt able to come up with it

i only had around 10 mins left when i got to that par

part

[fathom sun]

😭 yea 10 mins is crazy

[peak cave]

forgot u could just do min max lmao

honestly that was probably one of the most important parts of the code im prolly cooked for not getting it

[peak cave]

No we dont want average monthly balance, just total age of that account, so that we can use that in the calculation for the credit score. We do however need things like total balance and current balance as well but those are fairly straightforward to get

best way to do it now that i think of it is store all dates in a different hashmap, find min of those dates using min(dates) or something like that, then take the current date and subtract it from the oldest date to get age of accounts

yes we dont really merge the data

yeah i think in python u could do something like for _, date in dates.items(): minDate = min(curDate, date)

and age is likely in months although i did not ask since i didnt get to that

[fathom sun]

did the interviewer help you, like work with you on the problem

[peak cave]

she helped me throughout but on this part imo she was not being clear but tbh i shouldve been able to figure it out

thing that confused me the most was that the date range can span over a year

so iwas like how do u get age from 01202005 to 04022007 for example

the math for it isnt too bad

just couldnt come up with it

someone here said it earlier

(newest[0] - oldest[0]) * 12 + (newest[1] - oldest[1])

i only had like 10 mins left so i didnt have the time to do it

much harder than fraud or the other variants imo

nah since we were running out of time she just asked to explain the rest of my implementatoin for part 3 without code

and we just finished there

so p bad tech for me

behavioral was really easy, case went well too

if i had finished my tech id be confident

yeah

finished vcns in like 40 mins

yeah unlucky

[fathom sun]

T/T/T/T/F is the order of the configuration for vcns right?

[peak cave]

there was lots of info for fraud and cashback but 0 info for loan offers

wasnt even expecting that question

my friend took it with me today as well, he got cashback but he said his case was cooked

[fathom sun]

someone ik who did it yesterday got VCN for case, loans for technical

[peak cave]

how did they do on loans

[fathom sun]

solid

[peak cave]

damn im cooked lol

did he say the same thing for age of accounts like similar solution

[fathom sun]

didnt ask him about loans, asked him more about vcn

[peak cave]

i think it was current remaining balance vs initial balance actually

something like that

[fathom sun]

ok so ig they r giving one ez case and hard tech or one ez tech and hard case

[peak cave]

yeah vcns is light asf

i got survey on aug 14th but my interviewer took a month to scheudle my interview

[fathom sun]

damn mine took 1 day

[peak cave]

overall unlucky proc for me ig

hopefully ill get lucky here

[fathom sun]

yea it be like that

[peak cave]

ppl were saying u only need 2/3 but i dont think my tech was good enough to pass tbh

[fathom sun]

for the behavoiral did they ask let me about yourself

[peak cave]

nah

[fathom sun]

or y u wanna join c1

[peak cave]

nah

[fathom sun]

oh then behave shouldnt have been more than 15-20 mins

cause its only 3 questions

[peak cave]

yeah finished in 20 mins

[fathom sun]

did they ask the status qouo question

[peak cave]

yeah

do yall know which interview has the most weight

is it tech or case

[fathom sun]

tech imo

[peak cave]

also do yall know if they only require 2/3 or do u need like decent on all

[fathom sun]

from past reddit posts

[fathom sun]

https://www.reddit.com/r/csMajors/comments/1fwuuht/c1_tip_powerday_thoughts/

this person did well on tech and behave

ok on case

[fathom sun]

for vcn did you use nested dict or tuple?

sure!

i also have my own doc too 😭

👍

[peak cave]

neither u dont really write any code for it

[fathom sun]

oh yea mb, i meant loan

[peak cave]

nested dict but tuple for dates would be helpful

[lucid geyser]

@peak cave for the loan offers, are u supposed to map (YYYY, MM) to the balance of that month, and also at the same time keep a running balance or smth? what did u mean by current vs total balance.

[peak cave]

yeah use yyyy mm as key for ur map

balance iirc should be updated in that key, so like u should map yyyy, mm to amount, and amount updates based on the sum of amount paid and initial balance

current balance would be like ur current remaining, and i think i meant to say initial balance, so initial balance is what u started out with before any payments

[lucid geyser]

yep makes sense, and then u just feed into the equation to get some number and use if statements to find the best loan offer right?

[peak cave]

yeah thats right

[lucid geyser]

@peak cave what was ur case interview?

[peak cave]

vcn

[fathom sun]

were in the same boat, good behave and case, not so good tech 😭

i had vcn and fraud

chocked on q4 for fraud

[fathom sun]

ye

[fathom sun]

no thats q3

q4 is multi client

they asked me to implement it

ye

loop once to find avg, loop again to compare

[lucid geyser]

wtf there r 4 questions?? i got loan offer and only got to q3 the best offer and then he asked if i had any questions for him

[fathom sun]

Loan could only have 3 questions

[lucid geyser]

that better be it

🤞

[wind creek]

Same. But i feel vcn validation part might be changed since i got 2 invalid and 3 valid and first one was invalid

[fathom sun]

When was ur interview I got 4 t and 1 f

[wind creek]

Oct 1st for case

Wbu. When was your interview

[lucid geyser]

i got 4t1f too, oct1 case

[wind creek]

Did you get vcn?

[lucid geyser]

yes

[fathom sun]

Oct 1

[wind creek]

damn