HackerRank: The Maximum Subarray


HackerRank: The Maximum Subarray
Given an array A={a1,a2,,aN} of N elements, find the maximum possible sum of a
  1. Contiguous subarray
  2. Non-contiguous (not necessarily contiguous) subarray.
Empty subarrays should not be considered.
https://codepair.hackerrank.com/paper/Wz4rBXmv?b=eyJyb2xlIjoiY2FuZGlkYXRlIiwibmFtZSI6ImplZmZlcnl5dWFuIiwiZW1haWwiOiJ5dWFueXVuLmtlbm55QGdtYWlsLmNvbSJ9

  private static void findMaxSumSubArray(short[] arr) {
        long maxConSum = Long.MIN_VALUE, maxNonConSum = Long.MIN_VALUE, prevSum = 0;
        for(short x: arr) {
            int currentSum = x;
            if(prevSum > 0) {
                currentSum += prevSum;
            }
            if(currentSum > maxConSum) {
                maxConSum = currentSum;
            }
            prevSum = currentSum;
            if ( maxNonConSum < 0 && x > maxNonConSum) {
                maxNonConSum = x;
            } else if( maxNonConSum > 0 && x > 0) {
                maxNonConSum += x;
            }
        }
        System.out.println(maxConSum + " " + maxNonConSum);
    }
  def main(args: Array[String]) {
    var scan = new Scanner(System.in);
    var n = scan.nextInt();
    for( i <- 1 to n ){
      var size = scan.nextInt();
      var numArray = new Array[Int](size);
      for( j <- 0 to (size-1)){
        numArray(j)=scan.nextInt();
      }
      printMax( numArray);
    }
  }
 
  def printMax(nums: Array[Int]){
    var max = 0;
    var gen = 0;
var max_so_far = Integer.MIN_VALUE;
var all_neg=true;
var max_ele=Integer.MIN_VALUE;
for (i <- 0 until nums.length ) {
max += nums(i);
if (nums(i) > 0) {
gen += nums(i);
all_neg=false;
}

if(max_ele < nums(i) ){
max_ele=nums(i);
}
if (max < 0) {
max = 0;
}

if (max > max_so_far) {
max_so_far = max;
}
}

if(all_neg){
gen= max_ele;
        max_so_far=max_ele;
}

System.out.println(max_so_far+"\t"+gen);// << max_so_far << "\t" << gen<<endl;
  }

object Solution extends App {
  val sc = new Scanner(System.in)
  val out = new PrintWriter(System.out)
   
  def solve(): List[Long] = {
    val N = sc.nextInt
    val A = List.fill(N)(sc.nextLong)

    def cont(): Long = {
      @tailrec
      def loop(res: Long, acc: Long, xs: List[Long]): Long =
        xs match {
          case Nil =>
            res
          case h :: t =>
            val y = (acc + h) max 0
            loop(y max res, y, t)
        }

      loop(0, 0, A)
    }

    def nonCont(): Long = A.filter(_ > 0).sum

    if (A.forall(_ < 0)) List.fill(2)(A.max)
    else List(cont, nonCont)
  }
   
  for (_ <- 0 until sc.nextInt)
    out.println(solve.mkString(" "))
  out.flush
}




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