The Two-Pointer Technique is used to efficiently find pairs of elements from two different arrays that satisfy a certain condition - in this case, pairs that sum to 7.
We have BST1 with values in ascending order [2, 4, 6] and BST2 with values in descending order [5, 3, 1].
We'll use two pointers: one starting at the beginning of BST1 and another at the beginning of BST2.