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How to Solve Number of Valid Clock Times Problem
Master the Number of Valid Clock Times LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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LeetCode ProblemNumber of Valid Clock Times
You are given a string of length 5 called time, representing the current time on a digital clock in the format "hh:mm". The earliest possible time is "00:00" and the latest possible time is "23:59". In the string time, the digits represented by the ? symbol are unknown, and must be replaced with a digit from 0 to 9. Return an integer answer, the number of valid clock times that can be created by replacing every ? with a digit from 0 to 9.
StringEnumeration
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Problem Breakdown
Understanding the Number of Valid Clock Times Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a string of length 5 called time, representing the current time on a digital clock in the format "hh:mm". The earliest possible time is "00:00" and the latest possible time is "23:59". In the string time, the digits represented by the ? symbol are unknown, and must be replaced with a digit from 0 to 9. Return an integer answer, the number of valid clock times that can be created by replacing every ? with a digit from 0 to 9.
EasyProblem #2437
LeetCodeNumber of Valid Clock Times
Related Topics
StringEnumeration
How Phantom Code Helps
Get real-time assistance for Number of Valid Clock Times problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
time = "?5:00"
Output
2
# Example 2
Input
time = "0?:0?"
Output
100
# Example 3
Input
time = "??:??"
Output
1440
Constraints
time is a valid string of length 5 in the format "hh:mm".
"00" <= hh <= "23"
"00" <= mm <= "59"
Some of the digits might be replaced with '?' and need to be replaced with digits from 0 to 9.
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Solve Number of Valid Clock Times — You are given a string of length 5 called time, representing the current time on...
Here's the optimal approach using String:
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 Number of Valid Clock Times and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Number of Valid Clock Times 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 Valid Clock Times?
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 Valid Clock Times?
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 Valid Clock Times 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 Valid Clock Times 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 Valid Clock Times 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 Valid Clock Times 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 Valid Clock Times 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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