Bit Manipulation - Subsets Using Bitmask
Consider the backtracking subsets code below. What is the output when nums = [5]?
Consider the backtracking subsets code below. What is the output when nums = [5]?
medium🧾 Code Trace Q4 of Q15
Step-by-Step Solution
Solution:
Step 1: Trace backtrack calls for nums=[5]
Initial call adds [], then adds 5 and recurses, adding [5], then pops 5.Step 2: Check for duplicates
Since nums has one element, backtrack adds [] and [5] once each, no duplicates expected.Final Answer:
Option C -> Option CQuick Check:
Output includes empty and single-element subsets, no duplicates [OK]
Quick Trick: Backtracking appends path copy before recursion [OK]
Common Mistakes:
MISTAKES- Misunderstanding when subsets are appended
- Expecting duplicates due to recursion
Trap Explanation:
PITFALL- Candidates may think subsets are appended multiple times incorrectly, leading to duplicate subsets.
Interviewer Note:
CONTEXT- Tests candidate's understanding of recursion and subset appending order.
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