Dsa Bit Single Number

In this tutorial, you'll learn about How to Fix Single Number Errors. We cover key concepts, practical examples, and best practices.

Fix single number errors when XOR property not used or extra space instead of bit manipulation.

Quick Fix

Wrong

def single(n):
    return 2*sum(set(n))-sum(n)

Works but uses O(n) extra memory with set.

Right

def single(n):
    res=0
    for x in n: res^=x
    return res

[2,2,1] -> 1. [4,1,2,1,2] -> 4. O(n) time, O(1) space.

Prevention

XOR properties: a^a=0, a^0=a. XOR cancels all pairs, leaving the single element.

DodaTech Tools

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FAQ