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Merge pull requestneetcode-gh#2256 from josuebrunel/feat/0219-contains-duplicate-ii.go

Create 0219-contains-duplicate-ii.go

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	`1`	`+funccontainsNearbyDuplicate(nums []int,kint)bool {`
	`2`	`+seen:=make(map[int]int)`
	`3`	`+`
	`4`	`+fori,n:=rangenums {`
	`5`	`+ifj,ok:=seen[n];ok&&i-j<=k {`
	`6`	`+returntrue`
	`7`	`+}`
	`8`	`+seen[n]=i`
	`9`	`+}`
	`10`	`+returnfalse`
	`11`	`+}`

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