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Merge pull requestneetcode-gh#2298 from yaxarat/kotlin-280

Add 0280-wiggle-sort.kt

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	`1`	`+classSolution {`
	`2`	`+funwiggleSort(nums:IntArray):Unit {`
	`3`	`+for (iin1.. nums.lastIndex) {`
	`4`	`+val prev= nums[i-1]`
	`5`	`+val curr= nums[i]`
	`6`	`+`
	`7`	`+when (i%2) {`
	`8`	`+0-> {if (prev< curr) nums.swap(i) }`
	`9`	`+else-> {if (prev> curr) nums.swap(i) }`
	`10`	`+ }`
	`11`	`+ }`
	`12`	`+ }`
	`13`	`+`
	`14`	`+privatefun IntArray.swap(currentIndex:Int) {`
	`15`	`+this[currentIndex-1]=this[currentIndex].also {`
	`16`	`+this[currentIndex]=this[currentIndex-1]`
	`17`	`+ }`
	`18`	`+ }`
	`19`	`+}`

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