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// @Title: 只出现一次的数字 (Single Number)
// @Author: 15816537946@163.com
// @Date: 2020-02-18 23:22:08
// @Runtime: 8 ms
// @Memory: 4.6 MB
func singleNumber(nums []int) int {
    var ret int
    for _, n := range nums {
        ret ^=n
    }
    return ret
}