Code Challenge of the Day — Count two-sum pairs (medium)

I Want To Learn Programming

Posted on Jun 27 • Edited on Jul 15

#challenge #python #beginners #programming

Picks up where Two-sum indices left off.

Same setup as two-sum, but count how many index pairs (i<j) sum to target.
Write count_pairs(nums, target).

Starter:

def count_pairs(nums, target):
    # TODO
    pass

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