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735. Asteroid Collision

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	`1`	`+object Solution {`
	`2`	`+ def asteroidCollision(asteroids: Array[Int]): Array[Int] = {`
	`3`	`+ val stack = scala.collection.mutable.Stack.empty[Int]`
	`4`	`+ for (asteroid <- asteroids) {`
	`5`	`+ if (asteroid > 0) {`
	`6`	`+ stack.push(asteroid)`
	`7`	`+ } else {`
	`8`	`+ while (stack.nonEmpty && stack.top > 0 && stack.top < -asteroid) {`
	`9`	`+ stack.pop()`
	`10`	`+ }`
	`11`	`+ if (stack.nonEmpty && stack.top == -asteroid) {`
	`12`	`+ println(s"top=${stack.top} asteroid=$asteroid")`
	`13`	`+ stack.pop()`
	`14`	`+ } else if (stack.isEmpty \|\| stack.top < 0) {`
	`15`	`+ stack.push(asteroid)`
	`16`	`+ }`
	`17`	`+ }`
	`18`	`+ }`
	`19`	`+ stack.toArray.reverse`
	`20`	`+ }`
	`21`	`+}`
	`22`	`+`
	`23`	`+Solution.asteroidCollision(Array(5,10,-5)) // [5,10]`
	`24`	`+Solution.asteroidCollision(Array(8,-8)) // []`
	`25`	`+Solution.asteroidCollision(Array(10,2,-5)) // [10]`
	`26`	`+Solution.asteroidCollision(Array(-2,-1,1,2)) // [-2,-1,1,2]`
	`27`	`+Solution.asteroidCollision(Array(-3,-2,-1,1,2,3)) // [-3,-2,-1,1,2,3]`
	`28`	`+Solution.asteroidCollision(Array(3,2,1,-1,-2,-3)) // []`
	`29`	`+Solution.asteroidCollision(Array(-2,2,-1,-2)) // [-2]`
	`30`	`+`

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