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two sum scala
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//import org.json4s.DefaultFormats.++ | |
//import org.json4s.JsonDSL.int2jvalue | |
object Solution extends App { | |
def twoSum(nums: Array[Int], target: Int): Option[Array[Int]] = { | |
var leftIndex: Int = 0 | |
while (leftIndex < nums.length -1) { | |
println("*****") | |
println("The leftIndex: ") | |
println(leftIndex) | |
val leftValue: Int = nums(leftIndex) | |
var rightIndex: Int = leftIndex + 1 | |
for (r <- nums.takeRight(nums.length - rightIndex)) { | |
println("The rightIndex: ") | |
println(rightIndex) | |
if (r + leftValue == target) | |
{ | |
println("The leftValue: ") | |
println(leftValue) | |
println("The r: ") | |
println(r) | |
return Some(Array(leftIndex, rightIndex)) | |
} else { | |
// update the rightIndex | |
rightIndex = rightIndex + 1 | |
} | |
} | |
// update the left index | |
leftIndex = leftIndex + 1 | |
} | |
None | |
} | |
// test cases | |
val numsTest: Array[Int] = Array(2, 15, 11, 7) | |
val outArrayOption = twoSum(numsTest, 9) | |
println(outArrayOption) | |
val outArray: Array[Int] = outArrayOption match { | |
case Some(n) => | |
n | |
} | |
println(outArray.mkString("Array(", ", ", ")")) | |
} | |
// another way | |
/* | |
import scala.util.boundary, boundary.break | |
object Solution { | |
def twoSum(nums: Array[Int], target: Int): Array[Int] = { | |
var leftIndex: Int = 0 | |
boundary: | |
while (leftIndex < nums.length -1) { | |
val leftValue: Int = nums(leftIndex) | |
var rightIndex: Int = leftIndex + 1 | |
for (r <- nums.takeRight(nums.length - rightIndex)) { | |
if (r + leftValue == target) | |
break(Array(leftIndex, rightIndex)) | |
else | |
rightIndex = rightIndex + 1 | |
} | |
// update the left index | |
leftIndex = leftIndex + 1 | |
} | |
Array(-1,-1) | |
} | |
} | |
*/ |
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