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How to Solve Implement Rand10() Using Rand7() Problem
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Start Free for WindowsMedium#470
LeetCode ProblemImplement Rand10() Using Rand7()
Given the API rand7() that generates a uniform random integer in the range [1, 7], write a function rand10() that generates a uniform random integer in the range [1, 10]. You can only call the API rand7(), and you shouldn't call any other API. Please do not use a language's built-in random API. Each test case will have one internal argument n, the number of times that your implemented function rand10() will be called while testing. Note that this is not an argument passed to rand10().
MathRejection SamplingRandomizedProbability and Statistics
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Problem Breakdown
Understanding the Implement Rand10() Using Rand7() Problem
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Problem Statement
Given the API rand7() that generates a uniform random integer in the range [1, 7], write a function rand10() that generates a uniform random integer in the range [1, 10]. You can only call the API rand7(), and you shouldn't call any other API. Please do not use a language's built-in random API. Each test case will have one internal argument n, the number of times that your implemented function rand10() will be called while testing. Note that this is not an argument passed to rand10().
MediumProblem #470
LeetCodeImplement Rand10() Using Rand7()
Related Topics
MathRejection SamplingRandomizedProbability and Statistics
How Phantom Code Helps
Get real-time assistance for Implement Rand10() Using Rand7() problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
n = 1
Output
[2]
# Example 2
Input
n = 2
Output
[2,8]
# Example 3
Input
n = 3
Output
[3,8,10]
Constraints
1 <= n <= 105
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Solve Implement Rand10() Using Rand7() — Given the API rand7() that generates a uniform random integer in the range [1, 7...
Here's the optimal approach using Math:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Implement Rand10() Using Rand7() and using Phantom Code during coding interviews.
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Phantom Code generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
What if the interviewer asks follow-up questions or modifications to problems like Implement Rand10() Using Rand7()?
Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.
Can Phantom Code help me communicate my solution for problems like Implement Rand10() Using Rand7()?
Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.
How does Phantom Code assist with different programming languages for Implement Rand10() Using Rand7() type problems?
Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.
What coding mistakes does Phantom Code help me avoid during Implement Rand10() Using Rand7() interviews?
Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
Is Phantom Code detectable when solving problems like Implement Rand10() Using Rand7() during live interviews?
No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.
How does Phantom Code help when I'm struggling with Implement Rand10() Using Rand7() style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code work for the coding platforms used in Implement Rand10() Using Rand7() interviews?
Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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