dsapatterns©
01Home02Patterns03Questions04
Cheatsheet
05Notes06Dashboard

© 2026 DSAPatterns

dsapatterns©
Cheatsheet
dsapatterns©
01Home02Patterns03Questions04
Cheatsheet
05Notes06Dashboard

© 2026 DSAPatterns

dsapatterns©
Cheatsheet
dsapatterns©
01Home02Patterns03Questions04
Cheatsheet
05Notes06Dashboard

© 2026 DSAPatterns

dsapatterns©
Cheatsheet
dsapatterns©
01Home02Patterns03Questions04
Cheatsheet
05Notes06Dashboard

© 2026 DSAPatterns

dsapatterns©
Cheatsheet
Back to questions
QuestionsHash TablesLongest Consecutive Sequence

Longest Consecutive Sequence

MEDIUM

Master this problem using the Hash Tables pattern.

Solve on LeetCode
Pattern: Hash Tables
Pattern Intuition & Strategy

When approaching Longest Consecutive Sequence, look for key problem signals that suggest using the Hash Tables pattern. Focus on reducing redundant iterations, maintaining state invariant, and optimizing space-time complexity.

Key Invariant

Maintain optimal range bounds or hash frequency state during traversal.

Expected Complexity

Time: O(N) or O(N log N) | Space: O(1) to O(N)

Study Resource

Need code templates for Hash Tables?

Check out our visual cheatsheet with copy-paste C++ code skeletons.

View Cheatsheets

More Hash Tables Problems

See all →

Design HashMap

Hash Tables

EASY

Maximum Number of Balloons

Hash Tables

EASY

Number of Good Pairs

Hash Tables

EASY

Isomorphic Strings

Hash Tables

EASY

dsapatterns

SEE THE PATTERNS. MASTER THE ALGORITHMS. ACE THE INTERVIEWS.

Visual DSA pattern library built to turn complex algorithms into clear, intuitive structures.

LEARN

  • Patterns
  • Questions
  • Notes
  • Cheatsheet

BUILD

  • Notes

© 2026 DSAPATTERNS. ALL RIGHTS RESERVED.

DESIGNED & BUILT WITH CARE

FAQsPrivacy PolicyCookies Policy