keshavMM004/InterviewQuest

GOOGLE interview question

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#2 opened on Oct 7, 2024

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Description

Design a SnapshotArray that provides the following functionality:

SnapshotArray(int length): Initializes an array-like structure of the given length, with each element initially set to 0. void set(int index, int val): Updates the element at the specified index to the given value. int snap(): Captures a snapshot of the current state of the array and returns the snap_id, which is the number of times snap() has been called, minus 1. int get(int index, int snap_id): Returns the value at the specified index at the time the snapshot with the given snap_id was taken.

leetcode

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Research direction
Implement SnapshotArray using a list of maps (each index has a list of (snap id, value) pairs) and binary search to get the value at a given snap id. Use an integer snap counter and a global map for the current state.
Tech stack
java
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Javadata structures
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60