Commit fd45882

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practice yield

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	`1`	`+object Solution {`
	`2`	`+ def generateParenthesis(n: Int): List[String] = {`
	`3`	`+ if (n == 0){`
	`4`	`+ List("")`
	`5`	`+ }else{`
	`6`	`+ val candidates = for {`
	`7`	`+ i <- 0 to (n - 1);`
	`8`	`+ s1 <- generateParenthesis(i);`
	`9`	`+ s2 <- generateParenthesis(n - i - 1)`
	`10`	`+ } yield "(" + s1 + ")" + s2`
	`11`	`+ candidates.toList`
	`12`	`+ }`
	`13`	`+ }`
	`14`	`+}`

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