Practice Insert Delete GetRandom O(1) - Duplicates allowed
Master the Insert Delete GetRandom O(1) - Duplicates allowed LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
PhantomCodeAI generates complete solutions and debugging hints that you can use while explaining your approach, so you stay calm and in control.
Insert Delete GetRandom O(1) - Duplicates allowed
RandomizedCollection is a multiset. insert(val) always adds one occurrence and returns true only if the value was previously absent. remove(val) removes one occurrence if possible and reports success. getRandom() samples occurrences uniformly, so a repeated value is proportionally more likely. All methods require average O(1) time. Practice approach: Store every occurrence in a dense array and map values to sets of indices. Swap the last occurrence into a deleted slot and update both index sets carefully, including when the moved and removed values are equal. Sample an array index uniformly.
PhantomCodeAI will help you solve this problem in real-time during your interview
Understanding the Insert Delete GetRandom O(1) - Duplicates allowed Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
RandomizedCollection is a multiset. insert(val) always adds one occurrence and returns true only if the value was previously absent. remove(val) removes one occurrence if possible and reports success. getRandom() samples occurrences uniformly, so a repeated value is proportionally more likely. All methods require average O(1) time. Practice approach: Store every occurrence in a dense array and map values to sets of indices. Swap the last occurrence into a deleted slot and update both index sets carefully, including when the moved and removed values are equal. Sample an array index uniformly.
Source: Insert Delete GetRandom O(1) - Duplicates allowed on LeetCode. Use the original task for its coding environment and submissions.
Insert Delete GetRandom O(1) - Duplicates allowed
Related Topics
How PhantomCodeAI Helps
Get real-time assistance for Insert Delete GetRandom O(1) - Duplicates allowed problems during coding interviews. PhantomCodeAI provides instant solutions and explanations.
Examples
# Example 1
["RandomizedCollection","insert","insert","insert","remove","remove","getRandom"] [[],[4],[4],[7],[7],[4],[]]
[null,true,false,true,true,true,4]
Both insertions of 4 take effect, although the second returns false. Removing 7 and one 4 leaves one 4.
Constraints
How PhantomCodeAI Helps with LeetCode Problems
Reinforce undetectability, platform compatibility, and real-time assistance to remove any doubt.
PhantomCodeAI Interface Illustration
Example conversation in the desktop app. The controls below are illustrative.
Help me review my approach and explain its trade-offs.
Start with your inputs and expected result. Compare your approach against the examples, then discuss edge cases and its time and space costs.
Undetectability Checklist
Platform Compatibility
User results and traction
Thousands of developers use PhantomCodeAI. Social proof signals that this approach helps real candidates land offers across a range of companies.
Undetectability and technical details
Our native desktop architecture avoids common detection vectors used by browser extensions. We provide a clear checklist so you can run basic checks and confirm the app will be invisible.
Platform compatibility and limitations
We work with Zoom, HackerRank, CodeSignal, CoderPad and other web-based platforms. Check the compatibility note and request a browser link if a specific desktop app is unsupported.
Frequently Asked Questions
Common questions about solving Insert Delete GetRandom O(1) - Duplicates allowed and using PhantomCodeAI during coding interviews.
How does PhantomCodeAI help with LeetCode problems during a coding interview?
Which programming languages does PhantomCodeAI support?
Does PhantomCodeAI work with HackerRank, CodeSignal, and CoderPad?
Can PhantomCodeAI handle follow-up questions and modifications?
Is PhantomCodeAI detectable during live interviews?
Should I still practice these problems on my own first?
Related LeetCode Problems
Practice more problems similar to Insert Delete GetRandom O(1) - Duplicates allowed.
20+ Stealth Features. Zero Detection Cases.
The only AI interview tool with an undetectable desktop overlay, real-time audio listening, and personalized AI responses.