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How to Solve Average Waiting Time Problem
Master the Average Waiting Time LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#1701
LeetCode ProblemAverage Waiting Time
There is a restaurant with a single chef. You are given an array customers, where customers[i] = [arrivali, timei]: When a customer arrives, he gives the chef his order, and the chef starts preparing it once he is idle. The customer waits till the chef finishes preparing his order. The chef does not prepare food for more than one customer at a time. The chef prepares food for customers in the order they were given in the input. Return the average waiting time of all customers. Solutions within 10-5 from the actual answer are considered accepted.
ArraySimulation
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Problem Breakdown
Understanding the Average Waiting Time Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
There is a restaurant with a single chef. You are given an array customers, where customers[i] = [arrivali, timei]: When a customer arrives, he gives the chef his order, and the chef starts preparing it once he is idle. The customer waits till the chef finishes preparing his order. The chef does not prepare food for more than one customer at a time. The chef prepares food for customers in the order they were given in the input. Return the average waiting time of all customers. Solutions within 10-5 from the actual answer are considered accepted.
MediumProblem #1701
LeetCodeAverage Waiting Time
Related Topics
ArraySimulation
How Phantom Code Helps
Get real-time assistance for Average Waiting Time problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
customers = [[1,2],[2,5],[4,3]]
Output
5.00000
# Example 2
Input
customers = [[5,2],[5,4],[10,3],[20,1]]
Output
3.25000
Constraints
1 <= customers.length <= 105
1 <= arrivali, timei <= 104
arrivali <= arrivali+1
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Solve Average Waiting Time — There is a restaurant with a single chef. You are given an array customers, wher...
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def solve(input):
# Optimal O(n) solution
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Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Average Waiting Time and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Average Waiting Time 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 Average Waiting Time?
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 Average Waiting Time?
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 Average Waiting Time 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 Average Waiting Time 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 Average Waiting Time 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 Average Waiting Time 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 Average Waiting Time 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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