Intervals - Non-overlapping Intervals (Max Non-Overlap)
Given the following code, what is the output when intervals = [[1,3],[2,4],[3,5]]?
Given the following code, what is the output when intervals = [[1,3],[2,4],[3,5]]?
easy🧾 Code Trace Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Sort intervals by end time
Sorted intervals: [1,3], [2,4], [3,5]Step 2: Greedy selection
Select [1,3] (count=1), skip [2,4] (overlaps), select [3,5] (count=2)Final Answer:
Option C -> Option CQuick Check:
Two intervals selected without overlap [OK]
Quick Trick: Sort by end, pick earliest finishing [OK]
Common Mistakes:
MISTAKES- Counting overlapping intervals
- Off-by-one in comparisons
- Not sorting by end time
Trap Explanation:
PITFALL- Candidates often miscount intervals that start exactly at last_end or forget sorting.
Interviewer Note:
CONTEXT- Tests ability to trace greedy code on typical input.
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