Which edge case matters for this problem?
Practice this question from Single Number - XOR Cancellation Pattern Practice Quiz, with options and an explanation.
Question
Which edge case matters for this problem?
Option A — Correct answer
Every non-answer value must appear exactly twice.
Option B
Whether intervals overlap
Option C
Whether a graph has cycles
Option D
Whether a matrix is square
Explanation
Every non-answer value must appear exactly twice.