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How to Solve Subdomain Visit Count Problem
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Start Free for WindowsMedium#811
LeetCode ProblemSubdomain Visit Count
A website domain "discuss.leetcode.com" consists of various subdomains. At the top level, we have "com", at the next level, we have "leetcode.com" and at the lowest level, "discuss.leetcode.com". When we visit a domain like "discuss.leetcode.com", we will also visit the parent domains "leetcode.com" and "com" implicitly. A count-paired domain is a domain that has one of the two formats "rep d1.d2.d3" or "rep d1.d2" where rep is the number of visits to the domain and d1.d2.d3 is the domain itself. Given an array of count-paired domains cpdomains, return an array of the count-paired domains of each subdomain in the input. You may return the answer in any order.
ArrayHash TableStringCounting
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Problem Breakdown
Understanding the Subdomain Visit Count Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
A website domain "discuss.leetcode.com" consists of various subdomains. At the top level, we have "com", at the next level, we have "leetcode.com" and at the lowest level, "discuss.leetcode.com". When we visit a domain like "discuss.leetcode.com", we will also visit the parent domains "leetcode.com" and "com" implicitly. A count-paired domain is a domain that has one of the two formats "rep d1.d2.d3" or "rep d1.d2" where rep is the number of visits to the domain and d1.d2.d3 is the domain itself. Given an array of count-paired domains cpdomains, return an array of the count-paired domains of each subdomain in the input. You may return the answer in any order.
MediumProblem #811
LeetCodeSubdomain Visit Count
Related Topics
ArrayHash TableStringCounting
How Phantom Code Helps
Get real-time assistance for Subdomain Visit Count problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
cpdomains = ["9001 discuss.leetcode.com"]
Output
["9001 leetcode.com","9001 discuss.leetcode.com","9001 com"]
# Example 2
Input
cpdomains = ["900 google.mail.com", "50 yahoo.com", "1 intel.mail.com", "5 wiki.org"]
Output
["901 mail.com","50 yahoo.com","900 google.mail.com","5 wiki.org","5 org","1 intel.mail.com","951 com"]
Constraints
1 <= cpdomain.length <= 100
1 <= cpdomain[i].length <= 100
cpdomain[i] follows either the "repi d1i.d2i.d3i" format or the "repi d1i.d2i" format.
repi is an integer in the range [1, 104].
d1i, d2i, and d3i consist of lowercase English letters.
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Solve Subdomain Visit Count — A website domain "discuss.leetcode.com" consists of various subdomains. At the t...
Here's the optimal approach using Array:
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 Subdomain Visit Count and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Subdomain Visit Count during interviews?
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 Subdomain Visit Count?
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 Subdomain Visit Count?
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 Subdomain Visit Count 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 Subdomain Visit Count 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 Subdomain Visit Count 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 Subdomain Visit Count 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 Subdomain Visit Count 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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