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How to Solve Number of Visible People in a Queue Problem
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Start Free for WindowsHard#1944
LeetCode ProblemNumber of Visible People in a Queue
There are n people standing in a queue, and they numbered from 0 to n - 1 in left to right order. You are given an array heights of distinct integers where heights[i] represents the height of the ith person. A person can see another person to their right in the queue if everybody in between is shorter than both of them. More formally, the ith person can see the jth person if i < j and min(heights[i], heights[j]) > max(heights[i+1], heights[i+2], ..., heights[j-1]). Return an array answer of length n where answer[i] is the number of people the ith person can see to their right in the queue.
ArrayStackMonotonic Stack
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Problem Breakdown
Understanding the Number of Visible People in a Queue Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
There are n people standing in a queue, and they numbered from 0 to n - 1 in left to right order. You are given an array heights of distinct integers where heights[i] represents the height of the ith person. A person can see another person to their right in the queue if everybody in between is shorter than both of them. More formally, the ith person can see the jth person if i < j and min(heights[i], heights[j]) > max(heights[i+1], heights[i+2], ..., heights[j-1]). Return an array answer of length n where answer[i] is the number of people the ith person can see to their right in the queue.
HardProblem #1944
LeetCodeNumber of Visible People in a Queue
Related Topics
ArrayStackMonotonic Stack
How Phantom Code Helps
Get real-time assistance for Number of Visible People in a Queue problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
heights = [10,6,8,5,11,9]
Output
[3,1,2,1,1,0]
# Example 2
Input
heights = [5,1,2,3,10]
Output
[4,1,1,1,0]
Constraints
n == heights.length
1 <= n <= 105
1 <= heights[i] <= 105
All the values of heights are unique.
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Solve Number of Visible People in a Queue — There are n people standing in a queue, and they numbered from 0 to n - 1 in lef...
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 Number of Visible People in a Queue and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Number of Visible People in a Queue 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 Number of Visible People in a Queue?
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 Number of Visible People in a Queue?
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 Number of Visible People in a Queue 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 Number of Visible People in a Queue 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 Number of Visible People in a Queue 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 Number of Visible People in a Queue 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 Number of Visible People in a Queue 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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