leetcode Single Number
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上题:
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 nRet = 0; for (int i = 0; i < n; i++) { nRet ^= A[i]; } return nRet; }};
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