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Back to Problems

1118. Number of Days in a Month

Easy58.7% AcceptancePremium
Math
Asked by:
A
Amazon
ProblemHints (2)SolutionsVideosCompanies (1)Notes

Problem Statement

Premium Problem

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This is a premium problem. We're working on making it available for free soon.

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Problem Hints

Use these hints if you're stuck. Try solving on your own first.

1
Hint 1

Does February have 28 days or 29 days?

2
Hint 2

Think of Leap years.

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My Brain after 569 Leetcode Problems

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Asked By Companies

1 companies
A
Amazon

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Related Topics

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Problem Stats

Acceptance Rate58.7%
DifficultyEasy
Companies1

Practice on LeetCode

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Frequently Asked Questions

Is Number of Days in a Month asked in FAANG interviews?

Problems like this are occasionally used in interviews to test attention to detail and understanding of edge cases such as leap years. While simple, they help assess basic logic and conditional handling in coding interviews.

What data structure is best for Number of Days in a Month?

A simple array or list of month lengths works best. It allows direct indexing using the month number and keeps the solution clean and efficient. Only February requires a conditional adjustment for leap years.

What is the optimal approach for Number of Days in a Month?

The optimal approach is to store the number of days for each month in an array and adjust February based on leap year rules. This avoids complex branching and allows constant-time lookup. A quick leap year check determines whether February has 28 or 29 days.

How do you determine if a year is a leap year in this problem?

A year is a leap year if it is divisible by 4. However, years divisible by 100 are not leap years unless they are also divisible by 400. This rule ensures the calendar stays aligned with Earth's orbit.