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All topics›JavaScript›Bit manipulation

Single Number II

advancedlayer I11 · Bit manipulation5 tests

Every value in nums appears exactly three times except for one value, which appears once. Return that value.

  • Plain XOR no longer works — x ^ x ^ x is x, not 0
  • Aim for O(n) time and O(1) extra space
  • Values may be negative, so any solution must stay correct across all 32 bits including the sign bit

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