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Single Number
Given an array of integers, every element appears twice except for one. Find that single one.
Note:
Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory?
class Solution { public: int singleNumber(int A[], int n) { int data=http://www.mamicode.com/0; for(int i=0;i<n;i++) data=data^A[i]; return data; } };
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