Question: We are given an array that contains N numbers. We want to determine if there are two numbers whose sum equals a given number K.

We are given an array that contains N numbers. We want to determine if there are two numbers whose sum equals a given number K. For instance, if the input is 8, 4, 1, 6, and K is 10, then the answer is yes (4 and 6). A number may be used twice. Do the following:
a. Give an O(N2) algorithm to solve this problem.
b. Give an O(N logN) algorithm to solve this problem.

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