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Add kotlin/0261-graph-valid-tree.kt

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	`1`	`+classSolution {`
	`2`	`+privatelateinitvar adjList:Array<MutableList<Int>>`
	`3`	`+privateval seen= mutableSetOf<Int>()`
	`4`	`+`
	`5`	`+funvalidTree(n:Int,edges:Array<IntArray>):Boolean {`
	`6`	`+if (edges.size!= n-1) {`
	`7`	`+returnfalse`
	`8`	`+ }`
	`9`	`+`
	`10`	`+ adjList=Array(n) {mutableListOf() }`
	`11`	`+for (edgein edges) {`
	`12`	`+ adjList[edge[0]].add(edge[1])`
	`13`	`+ adjList[edge[1]].add(edge[0])`
	`14`	`+ }`
	`15`	`+ dfs(0)`
	`16`	`+`
	`17`	`+return seen.size== n`
	`18`	`+ }`
	`19`	`+`
	`20`	`+privatefundfs(node:Int) {`
	`21`	`+if (seen.contains(node)) {`
	`22`	`+return`
	`23`	`+ }`
	`24`	`+ seen.add(node)`
	`25`	`+for (adjin adjList[node]) {`
	`26`	`+ dfs(adj)`
	`27`	`+ }`
	`28`	`+ }`
	`29`	`+}`

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