# MY Java Solution - a bit heavy

• ``````import java.util.*;

class Solution {
static int[] twoSum(int[] nums, int target) {
ArrayList<Integer> list = new ArrayList<>();
ArrayList<Integer> originalList = new ArrayList<>();

for (int i = 0; i < nums.length; i++)
{
}
originalList = (ArrayList) list.clone();

Collections.sort(list);

return seekingNumbers(list, target, originalList);
}

/**
* Introduce a method to recursively getting the two numbers at the very beginning and end of the list, and compare with the target
*
* @param list
* @param target
* @param originalList
* @return
*/
private static int[] seekingNumbers(ArrayList list, int target, ArrayList originalList){
int[] result = new int[2];
if (list.size() == 1){
return result;
}
int firstValue = ((Integer)list.get(0)).intValue();

if (firstValue >= target) {
return result;
}

int lastValue = ((Integer)list.get(list.size() - 1)).intValue();
int sum = firstValue + lastValue;
if (sum == target){
result[0] = originalList.indexOf(firstValue);
result[1] = originalList.indexOf(lastValue);
return result;
} else if (sum < target){
list.remove(0);
return seekingNumbers(list, target, originalList);
} else if (sum > target){
list.remove(list.size() - 1);
return seekingNumbers(list, target, originalList);
} else {
return result;
}
}
}
``````

when I submit the code, it says stackoverflowerror. while I put it down my local and see the error happens in

``````else if (sum > target){
list.remove(list.size() - 1);
seekingNumbers(list, target, originalList);
}
``````

It only happens when the nums size is bit bigger (on my local, it is 5622).
Can anyone help out why is that? Thank you.

Jimmy

• Knew what was happening, it is actually "overflow" because the stack size if not big enough for the 10000 times recursion.

New to java, good to know it.

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