Question: ( 2 0 % ) Given a set of S of n integers and another integer x , we want to determine whether or not

(20%) Given a set of S of n integers and another integer x, we want to determine whether or not there exist two elements in S whose sum is exactly x.
Design a brute-force algorithm to solve it. What is the time complexity?
Design an algorithm to solve this problem in O(nlogn) worst-case time.
(20%) Given a set of S of n integers and another

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