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AndreaAccept each order only once. · 1:02

Hearing you

1Within a batch
2Across deliveries

processBatch.tsAndrea sees your latest code

Opening your editor…

Run the checks whenever you want real feedback.

How it works

Every round does three things.

It talks with you.

Interrupt, ask why, think out loud.

Interrupt anytimeAnswers “why”Replies in < 1 s

AndreaAccept each order only once. · 1:02

Hearing you

1Within a batch
2Across deliveries

processBatch.tsAndrea sees your latest code

Opening your editor…

Run the checks whenever you want real feedback.

It watches you practise.

It sees every edit and points at what matters.

Live awarenessPoints, never dictatesCode, whiteboard, speech

AndreaAccept each order only once. · 3:02

Listening · speak anytime

1Within a batch
2Across deliveries

Okay, initialize the set with already processed. Then your loop only needs to check the set once before accepting.

You Yes

Conversation 17

You
The function should return one of the two orders. Basically, we're talking about de-duplication here
Andrea
Exactly. Keep it once, skip the repeat. How might your code remember which order IDs it's already seen while looping through this batch?
You
We could create one set inside the function, and basically store the IDs there
Andrea
Yes. A set of seen IDs inside this function would let you check before pushing into accepted order IDs. Try that and see if you can skip the second A in the loop.
You
But one question here, why is a set better than map
Andrea
For this yes or no membership check, a set is simpler: add if new, check if seen. A map is useful when you need to store extra data per ID. Here, we just care if we've seen it already.
You
Got it. So, what should be our next move
Andrea
After you've tried the in-batch set, we'll add a check against already processed so we skip orders that were handled in an earlier delivery.
You
Okay, So, I'm feeling lost right now. Guide me step by step, please
Andrea
Sure. First, inside process batch, create an empty set to track seen IDs before the for loop that goes through the records. Go ahead and try that.
Andrea
Good,
You
Like this
Andrea
Yep, that's the start. Next, inside the loop, before you push into accepted order IDs, just ask, have we already seen this order ID, and only accept it if we have not.
You
Shouldn't I instantiate this seen set with already processed
Andrea
That's a good thought. You can either seed the set with already processed, or check both the set and already processed when deciding whether to accept. Do you want the simpler seed approach?
You
Yes
Andrea
Okay, initialize the set with already processed. Then your loop only needs to check the set once before accepting.

processBatch.tsAndrea sees your latest code

Opening your editor…

Run the checks whenever you want real feedback.

It keeps score.

Real checks, honest reviews, one next step.

Real testsProgress over timeOne next step

AndreaAccept each order only once. · 4:27

Listening · speak anytime

1Within a batch
2Across deliveries

It has add.

You Does the set has a method called add or push

Conversation 27

You
The function should return one of the two orders. Basically, we're talking about de-duplication here
Andrea
Exactly. Keep it once, skip the repeat. How might your code remember which order IDs it's already seen while looping through this batch?
You
We could create one set inside the function, and basically store the IDs there
Andrea
Yes. A set of seen IDs inside this function would let you check before pushing into accepted order IDs. Try that and see if you can skip the second A in the loop.
You
But one question here, why is a set better than map
Andrea
For this yes or no membership check, a set is simpler: add if new, check if seen. A map is useful when you need to store extra data per ID. Here, we just care if we've seen it already.
You
Got it. So, what should be our next move
Andrea
After you've tried the in-batch set, we'll add a check against already processed so we skip orders that were handled in an earlier delivery.
You
Okay, So, I'm feeling lost right now. Guide me step by step, please
Andrea
Sure. First, inside process batch, create an empty set to track seen IDs before the for loop that goes through the records. Go ahead and try that.
Andrea
Good,
You
Like this
Andrea
Yep, that's the start. Next, inside the loop, before you push into accepted order IDs, just ask, have we already seen this order ID, and only accept it if we have not.
You
Shouldn't I instantiate this seen set with already processed
Andrea
That's a good thought. You can either seed the set with already processed, or check both the set and already processed when deciding whether to accept. Do you want the simpler seed approach?
You
Yes
Andrea
Okay, initialize the set with already processed. Then your loop only needs to check the set once before accepting.
You
Done
Andrea
Nice. Now inside the loop, before accepted order IDs, check whether the set has this ID. If it does, skip it. If not, add it to the set and accept it. Give that a try.
You
Okay, basically, I can do, like this, if and then I can call the set, which is seen, as order
You
, Well, then, basically, I can just, continue
You
Is this correct
Andrea
Yes, that's it for skipping duplicates. Now just remember to add the new ID to the set at the same time you accept it, so the next duplicate will be caught.
You
How do I do that
Andrea
Right after the if block, add the current order ID to the seen set, and then push it into accepted order IDs. Two separate lines, one after another.
You
Does the set has a method called add or push
Andrea
It has add.

processBatch.tsAndrea sees your latest code

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Every round, every role

Andrea runs coding rounds. Your path covers every round.

Recruiter screens, technical rounds, behavioural questions, the salary talk and your promotion case. In English, German or Spanish, for engineers, nurses or sales. Examples:

AndreaLive nowLive coding round

What could remember the order IDs you’ve already seen?

NovaLive nowSystem design round

What happens to an order event while a store is offline?

LenaLive nowRecruiter call · Deutsch

Sag lieber: „Mein Tagessatz liegt bei 900 Euro.“

MayaLive nowBehavioural round

Good story. Now give me the number.

RileyTake-home review

Walk me through why you cached it there.

KaiSalary negotiation

You said yes to the first number. What would you ask first?

TheoPromotion case

Show me the impact, not the effort.

InesNursing panel interview

Tell me how you handled the night the ward was short.

RileyTake-home review

Walk me through why you cached it there.

KaiSalary negotiation

You said yes to the first number. What would you ask first?

TheoPromotion case

Show me the impact, not the effort.

InesNursing panel interview

Tell me how you handled the night the ward was short.

AndreaLive nowLive coding round

What could remember the order IDs you’ve already seen?

NovaLive nowSystem design round

What happens to an order event while a store is offline?

LenaLive nowRecruiter call · Deutsch

Sag lieber: „Mein Tagessatz liegt bei 900 Euro.“

MayaLive nowBehavioural round

Good story. Now give me the number.

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Every mock round is recorded, reviewed and compared. You always know what improved, what’s next, and how many days are left.

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Your progress · Deduplication4.4/5

+2.6 since attempt 1

Correctness

Reasoning

Explaining

Next step

Explain why the order must be recorded before it’s accepted.

For candidates and career coaches

Paste the job. Get the whole prep.

1
Paste the CV and the job description
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2
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3
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Rehearse the interviewout loud.

Every round does three things.

Every round does three things.

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It watches you practise.

It keeps score.

Paste the CV and the job description

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Walk in ready

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Rehearse the interview
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