Pascal's Triangle Build It Without Any Formula | LeetCode 118 | Python
Every number in Pascal's Triangle can be built using the row above it no formula needed.
In this video, we break down LeetCode 118 (Pascal's Triangle) with:
✅ A complete visual trace building all 5 rows step by step
✅ Clean Python code line by line explanation
✅ The #1 misconception why you DON'T need nCr or factorials
✅ Complexity analysis why O(n²) is optimal here
✅ 3 practice problems to solidify the pattern
This is Part 4 of the Arrays & Hashing series in our 227-problem DSA placement roadmap.
⏱️ TIMESTAMPS
0:00 Hook: The Pattern That Builds Itself
0:26 Cold Open: How Middle Values Are Created
1:08 Predict: Can You Build Row 5?
1:45 Full Visual Trace: All 5 Rows Step by Step
5:32 Python Code: Line by Line
7:08 Misconception: Do You Really Need nCr?
8:04 Complexity: O(n²) Time & Space + Practice Set
🔗 PRACTICE THESE NEXT
• LeetCode 119 Pascal's Triangle II (Easy)
• LeetCode 509 Fibonacci Number (Easy)
• LeetCode 70 Climbing Stairs (Easy)
🔗 FULL PLAYLIST
Arrays & Hashing: [link to playlist]
📚 THE DEEPER PATTERN
When your current result depends on the previous result reuse the previous state to build the next state. Previous row → build → next row. That's the core idea behind Pascal's Triangle, Fibonacci, and dozens of DP problems.
💬 Drop a comment: Did you know you don't need nCr for this problem?
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