The input contains time intervals that may overlap or touch, and callers need to find records covering a given instant. Describe or implement a merge and query strategy, including whether endpoints are inclusive.

Shared reading guide · question-specific review pending

The sections below are shared prompts, not verified conclusions about this question. Restate the concrete problem and check which prompts actually apply; do not infer a candidate trait from this guide.

Objective problem to resolve or clarify

Question-specific objective analysis has not been reviewed yet. First restate the decision, uncertainty, or task that this prompt asks you to resolve.

What it examines

Assess data-structure choice, boundary contracts, and complexity analysis.

Signals worth noticing

Defines endpoint inclusion, empty and touching intervals, and original record identities required in results.
Compares scans, interval indexes, or source-preserving merges rather than confusing a union with all matching records.
Explains construction, updates, queries, output-size costs, and space.
Tests nested, overlapping, duplicate, boundary, and large inputs for complete results without incorrect merging.

Context worth asking for

What limits would a static sorted approach face when records are continuously added and removed?
How would you test for off-by-one errors at interval boundaries?
If late data can arrive arbitrarily far in the past, how would you change the online merge and query contract?
When a memory limit is reached, which results would you retain or where would you persist state?
If input volume grows tenfold while the memory budget stays fixed, which assumption or design would you revisit first?
What goal, baseline, constraints, and responsibility boundary applied?
What options were available, and what evidence or dependencies shaped the choice?
Who was affected, what changed, and over what time window?
How was the result verified, and what alternative explanation or downside was considered?

Shared analysis and assessment prompts

What else the answer may imply

No question-specific inference has been reviewed. Treat the stated intent as a hypothesis, and check alternative explanations against the person’s role, opportunity, responsibility, and evidence.

Decision after context

After establishing context, compare plausible options against the stated goal and constraints. Make the decision rule explicit, note uncertainty and reversible steps, and say what evidence would change the choice.

Examine the trade-offs

Benefits created

Which part of the stated objective does each option address, and who benefits?
What observable outcome, baseline, and time window would show improvement?

Costs and risks

What direct, ongoing, and opportunity costs would each option introduce, and who carries them?
What could fail, become harder to change, or affect other people; what evidence would justify the risk?

Assessment guide

Use these as evidence anchors for this capability, not as an automatic score or an overall judgment of a person. Calibrate expectations to the role, level, and scope. A score of 2 is the usual baseline; excellent evidence in one or two dimensions is meaningful, while exceptional evidence is rare.

1 · Not passing

Core concepts or basic facts are unclear; the reasoning or account of events cannot be followed. For experience questions, the person cannot distinguish their own actions and responsibility. Confirmed deliberate fabrication is not passing; inconsistency or missing detail alone is a reason to verify, not proof of dishonesty.

Cannot explain the question’s relevant concepts, facts, or reasoning in a way that can be checked.

2 · Passing

Explains the basic concepts and approach clearly and gives credible evidence of having done the work or being able to reason through it.

Explains a reasonable basic approach and supports it with relevant experience or a coherent, checkable line of reasoning.

3 · Excellent

Gives a structured account, reflects clearly on what worked and what did not, weighs benefits against costs or risks, and offers an insight or practice above the ordinary expectation for the role and level.

Shows structured reasoning, relevant comparisons, trade-offs, and a useful insight above the usual expectation for the role and scope.

4 · Exceptional

Shows an outcome or practice at an exceptional, field-leading level for the relevant scope. The impact is measurable, independently supportable, and credibly attributable to the person’s decisions and work.

Provides independently checkable evidence of exceptional impact for the relevant scope and explains contribution, attribution limits, and conditions.

Question context and related views

RoleGeneral software engineering · Frontend · Backend · Mobile · AI engineering · Data engineering

Responsibility scopeIndividual work

Career trackIndividual contributor

Select questions for the responsibility you actually hold or seek. These labels are not universal stage requirements. Stage expectations

Same question, different stage expectations

The question stays the same. Choose a target to compare responsibility, reasoning, and evidence. This changes the reading framework, not the question’s difficulty or your score.

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Target roleTarget responsibility

These are rule-based reading prompts, not separately reviewed stage-specific answers or a verdict that this question applies to every stage. Use your actual role and authority.

View the full role and stage model →

Compare expectations across stages

This table compares responsibility lenses, not mandatory question coverage or a ranking of people.

Stage	Responsibility	Result evidence

Want deeper feedback? Generate a prompt with this question’s evidence framework, then choose an AI tool yourself.

AI analysis prompt

# Interview Compass response analysis
Analyze the candidate response using only evidence provided. Do not invent facts.

## Question and review status
Question: The input contains time intervals that may overlap or touch, and callers need to find records covering a given instant. Describe or implement a merge and query strategy, including whether endpoints are inclusive.
Analysis review status: Shared reading guide · question-specific review pending. The sections below are shared prompts, not verified conclusions about this question. Restate the concrete problem and check which prompts actually apply; do not infer a candidate trait from this guide.
Objective problem: Question-specific objective analysis has not been reviewed yet. First restate the decision, uncertainty, or task that this prompt asks you to resolve.
Assessment intent: Assess data-structure choice, boundary contracts, and complexity analysis.
Possible inference (a hypothesis to verify): No question-specific inference has been reviewed. Treat the stated intent as a hypothesis, and check alternative explanations against the person’s role, opportunity, responsibility, and evidence.

## Evidence framework
Observable signals:
- Defines endpoint inclusion, empty and touching intervals, and original record identities required in results.
- Compares scans, interval indexes, or source-preserving merges rather than confusing a union with all matching records.
- Explains construction, updates, queries, output-size costs, and space.
- Tests nested, overlapping, duplicate, boundary, and large inputs for complete results without incorrect merging.
Context worth asking for:
- What limits would a static sorted approach face when records are continuously added and removed?
- How would you test for off-by-one errors at interval boundaries?
- If late data can arrive arbitrarily far in the past, how would you change the online merge and query contract?
- When a memory limit is reached, which results would you retain or where would you persist state?
- If input volume grows tenfold while the memory budget stays fixed, which assumption or design would you revisit first?
- What goal, baseline, constraints, and responsibility boundary applied?
- What options were available, and what evidence or dependencies shaped the choice?
- Who was affected, what changed, and over what time window?
- How was the result verified, and what alternative explanation or downside was considered?
Comparison dimensions:
Decision after context: After establishing context, compare plausible options against the stated goal and constraints. Make the decision rule explicit, note uncertainty and reversible steps, and say what evidence would change the choice.
Benefits to examine:
- Which part of the stated objective does each option address, and who benefits?
- What observable outcome, baseline, and time window would show improvement?
Costs and risks to examine:
- What direct, ongoing, and opportunity costs would each option introduce, and who carries them?
- What could fail, become harder to change, or affect other people; what evidence would justify the risk?

## 1–4 evidence anchors
- 1 · Not passing: Core concepts or basic facts are unclear; the reasoning or account of events cannot be followed. For experience questions, the person cannot distinguish their own actions and responsibility. Confirmed deliberate fabrication is not passing; inconsistency or missing detail alone is a reason to verify, not proof of dishonesty. Question-specific reference: Cannot explain the question’s relevant concepts, facts, or reasoning in a way that can be checked.
- 2 · Passing: Explains the basic concepts and approach clearly and gives credible evidence of having done the work or being able to reason through it. Question-specific reference: Explains a reasonable basic approach and supports it with relevant experience or a coherent, checkable line of reasoning.
- 3 · Excellent: Gives a structured account, reflects clearly on what worked and what did not, weighs benefits against costs or risks, and offers an insight or practice above the ordinary expectation for the role and level. Question-specific reference: Shows structured reasoning, relevant comparisons, trade-offs, and a useful insight above the usual expectation for the role and scope.
- 4 · Exceptional: Shows an outcome or practice at an exceptional, field-leading level for the relevant scope. The impact is measurable, independently supportable, and credibly attributable to the person’s decisions and work. Question-specific reference: Provides independently checkable evidence of exceptional impact for the relevant scope and explains contribution, attribution limits, and conditions.

## Analysis instructions
1. Separate explicit evidence, missing context, and hypotheses. Cite exact words or facts from the response.
2. List the most important follow-up questions first. If there is not enough evidence, state “insufficient evidence; do not score.”
3. Assess each relevant signal against the 1–4 anchors only when supported; explain evidence and uncertainty.
4. Discuss comparison choices, causal reasoning, trade-offs, and the candidate’s actual participation where relevant. Identify strengths, unsupported conclusions, and one concrete next practice.
5. Do not provide a sample answer, rewrite the response as a script, diagnose personality, infer dishonesty from inconsistency alone, combine scores into an overall score, or recommend hiring/rejection.

If the response is not provided, ask the candidate to paste their response first; do not analyze or score the question alone.
Do not write a sample answer.