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[03/01] 實際02/17, 136-singleNumber,透過異或運算

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Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,9 @@`
`1`	`1`	`package algo`
`2`	`2`
	`3`	`+func singleNumber(nums []int) int {`
	`4`	`+ bit := 0`
	`5`	`+ for _,num := range nums{`
	`6`	`+ bit ^=num`
	`7`	`+ }`
	`8`	`+ return bit`
	`9`	`+}`

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