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What is the output of the optimal bitwise AND range function for input left=0, right=0?

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Bit Manipulation - Bitwise AND of Numbers Range
What is the output of the optimal bitwise AND range function for input left=0, right=0?
A0
B1
CError or infinite loop
D-1
Step-by-Step Solution
Solution:

  1. Step 1: Check loop condition with left=0, right=0

    Since right is not greater than left, loop does not execute.

  2. Step 2: Return right which is 0

    Output is 0 as expected for single element range.

  3. Final Answer:

    Option A -> Option A

  4. Quick Check:

    Single number AND with itself is the number [OK]
Quick Trick: Loop skips if left == right [OK]
Common Mistakes:
MISTAKES
  • Assuming loop runs even if left == right
  • Returning wrong default value
Trap Explanation:
PITFALL
  • Candidates sometimes expect loop to run or error on single-element range, but it does not.
Interviewer Note:
CONTEXT
  • Tests handling of edge cases in bitwise AND range code.
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