package com.ztoais.dailycoding.algoexpert.easy
/*
Two Number Sum
Write a function that takes in a non-empty array of distinct integers and an integer representing a target sum. If any
two numbers in the input array sum up to the target sum, the function  should return then in an array. in any order. if
no two numbers sum up the target sum, the function should return an empty array.

Note that the target sum has to be obtained by summing two different integers in the array: you can't add a single integer
to itself in order to obtain the target sum.

You can assume that there will be at most one pair of numbers summing up to the target sum.
 */

//Sample input
/*
{
  "array": [3, 5, -4, 8, 11, 1, -1, 6],
  "targetSum": 10
}
//Sample output
 [-1,11]
 */
fun twoNumberSum(array: MutableList<Int>,targetSum:Int):List<Int>{
    val initialValue = array[0]

    val newArray = mutableListOf<Int>()

    array.drop(1).forEach{nextValue ->
        if(initialValue+nextValue == targetSum){
            return listOf(initialValue,nextValue)
        }else{
            newArray.add(nextValue)
        }
    }

    if(newArray.size >1){
        return twoNumberSum(newArray,targetSum)
    }

    return listOf()
}

/*
 //Test cases

 Test Case 1
{
  "array": [3, 5, -4, 8, 11, 1, -1, 6],
  "targetSum": 10
}
Test Case 2
{
  "array": [4, 6],
  "targetSum": 10
}
Test Case 3
{
  "array": [4, 6, 1],
  "targetSum": 5
}
Test Case 4
{
  "array": [4, 6, 1, -3],
  "targetSum": 3
}
Test Case 5
{
  "array": [1, 2, 3, 4, 5, 6, 7, 8, 9],
  "targetSum": 17
}
Test Case 6
{
  "array": [1, 2, 3, 4, 5, 6, 7, 8, 9, 15],
  "targetSum": 18
}
Test Case 7
{
  "array": [-7, -5, -3, -1, 0, 1, 3, 5, 7],
  "targetSum": -5
}
Test Case 8
{
  "array": [-21, 301, 12, 4, 65, 56, 210, 356, 9, -47],
  "targetSum": 163
}
Test Case 9
{
  "array": [-21, 301, 12, 4, 65, 56, 210, 356, 9, -47],
  "targetSum": 164
}
Test Case 10
{
  "array": [3, 5, -4, 8, 11, 1, -1, 6],
  "targetSum": 15
}
Test Case 11
{
  "array": [14],
  "targetSum": 15
}
Test Case 12
{
  "array": [15],
  "targetSum": 15
}
 */