# Target Indices

4
Have you seen this question before?

Given an array and a target integer, write a function sum_pair_indices that returns the indices of two integers in the array that add up to the target integer. If not found, just return an empty list.

Note: Can you do it on $O(n)$ time?

Note: Even though there could be many solutions, only one needs to be returned.

Example 1:

Input:

array = [1 2 3 4]
target = 5


Output:

def sum_pair_indices(array, target) -> [0 3] or [1 2]


Example 2:

Input:

array = [3]
target = 6


Output:

Do NOT return [0 0] as you can't use an index twice.

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Python 3.9.6