🔥 Day 22/90 | Intervals Pattern Mastery (LeetCode 986 & 3169) | DSA Pattern You Must Know!

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🔥 Day 22 / 90 — Intervals Pattern Mastery (LeetCode 986 & 3169)

In Day 22 of the Babua DSA Patterns Course, we deep-dive into the Intervals Pattern by solving two important interview problems that test your ability to compare, intersect, and reason about ranges efficiently.

📌 Problems covered in this lecture:

✅ LeetCode 986 – Interval List Intersections
Learn how to:

Use two pointers to traverse two interval lists

Detect overlaps using clean mathematical conditions

Build intersections without extra space

Reduce a brute-force O(N²) approach to O(N + M)

✅ LeetCode 3169 – Count Days Without Meetings
Understand how to:

Merge overlapping meeting intervals

Identify gaps between intervals

Translate real-world calendar logic into interval math

Avoid off-by-one mistakes in range problems

🧠 What You’ll Learn in This Video

When two intervals overlap (intuition + formula)

Why only one pointer moves at a time

How sorting simplifies interval problems

Difference between merge vs intersection

Common interview traps in interval questions

🎯 Why This Lesson Matters

Intervals are guaranteed interview favorites:

Calendar scheduling

Meeting rooms

Time ranges

Availability checks

System design edge cases

Once you master this pattern, multiple problems collapse into the same logic.

📘 Part of the 90 Days Babua DSA Patterns Course

This course focuses on:

Pattern-based thinking (not rote memorization)

Interview-ready logic

Clean code + intuition

FAANG-level problem solving

👉 Watch till the end to lock the Intervals Pattern for life.

🚀 Next Up

More interval + two-pointer hybrid problems as we push closer to advanced interview patterns.

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CHAPTERS
00:00 - Introduction & Recap
01:15 - LeetCode 986 - Theory
21:30 - LeetCode 986 - Code
32:42 - LeetCode 3169 - Theory
43:26 - LeetCode 3169 - Code
55:05 - Conclusion

#DSAPatterns2025 #DSAin90Days #CodingInterviewPreparation #FAANGPreparation #LeetCodePatterns #CTOBhaiya #DSAMastery #DataStructuresAndAlgorithms #CodingInterviewBootcamp #LearnDSA #CodingChallenge #ProblemSolvingPatterns #ZeroToHeroDSA #ThinkInPatterns #90DayDSAChallenge #DSAPlaybook #CrackFAANG #JavaDSA #PythonDSA #CodingJourney #FAANGInterviewPrep #IITianDSACourse #DSACourse2025 #LearnCodeCrack #DSAPlaylist #CrackCodingInterviews #ProgrammingLogic #DSACompleteCourse #DSARevision #DSAStudyPlan

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