摘要：链接:http://oj.leetcode.com/problems/single-number/Given an array of integers, every element appearstwiceexcept for one. Find that single one.Note:Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory?解法:可以根据异或运算的配对性定理可以解此题.配对性定理可以详见:http://wenku.bai 阅读全文