splitArray({1,2,3,4}) ==> true
splitArray({1,2,4}) ==> false
start_index >= length of the array
, return true
if the target is zero, false
otherwise.groupSum(start_index+1, arr,
target - arr[start_index]))
groupSum(start_index+1, arr, target)
public static boolean splitArray(int[] arr) { }
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Python