How to Solve Binary Watch Leetcode Problem - Interview Coder Guide
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How to Solve Binary Watch Problem

Master the Binary Watch LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.

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Easy#401
LeetCode Problem

Binary Watch

A binary watch has 4 LEDs on the top to represent the hours (0-11), and 6 LEDs on the bottom to represent the minutes (0-59). Each LED represents a zero or one, with the least significant bit on the r...

BacktrackingBit Manipulation

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Problem Breakdown

Understanding the Binary Watch Problem

Let's break down this LeetCode problem and understand what makes it challenging in interview settings.

Problem Statement

A binary watch has 4 LEDs on the top to represent the hours (0-11), and 6 LEDs on the bottom to represent the minutes (0-59). Each LED represents a zero or one, with the least significant bit on the right. For example, the below binary watch reads "4:51". Given an integer turnedOn which represents the number of LEDs that are currently on (ignoring the PM), return all possible times the watch could represent. You may return the answer in any order. The hour must not contain a leading zero. For example, "01:00" is not valid. It should be "1:00". The minute must consist of two digits and may contain a leading zero. For example, "10:2" is not valid. It should be "10:02".

EasyProblem #401
LeetCode

Binary Watch

Related Topics
BacktrackingBit Manipulation
How Interview Coder Helps

Get real-time assistance for Binary Watch problems during coding interviews. Interview Coder provides instant solutions and explanations.

Examples

Example 1
INPUT
turnedOn = 1
OUTPUT
["0:01","0:02","0:04","0:08","0:16","0:32","1:00","2:00","4:00","8:00"]
Example 2
INPUT
turnedOn = 9
OUTPUT
[]

Constraints

0 <= turnedOn <= 10

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Zoom
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Google Meet
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HackerRank
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CodeSignal
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CoderPad
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Frequently Asked Questions

Common questions about solving Binary Watch and using Interview Coder during coding interviews.

Interview Coder 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.

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