data_structures.arrays.pairs_with_given_sum
===========================================

.. py:module:: data_structures.arrays.pairs_with_given_sum

.. autoapi-nested-parse::

   Given an array of integers and an integer req_sum, find the number of pairs of array
   elements whose sum is equal to req_sum.

   https://practice.geeksforgeeks.org/problems/count-pairs-with-given-sum5022/0



Functions
---------

.. autoapisummary::

   data_structures.arrays.pairs_with_given_sum.pairs_with_sum


Module Contents
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.. py:function:: pairs_with_sum(arr: list, req_sum: int) -> int

   Return the no. of pairs with sum "sum"
   >>> pairs_with_sum([1, 5, 7, 1], 6)
   2
   >>> pairs_with_sum([1, 1, 1, 1, 1, 1, 1, 1], 2)
   28
   >>> pairs_with_sum([1, 7, 6, 2, 5, 4, 3, 1, 9, 8], 7)
   4