Key Pair
Easy Accuracy: 41.51% Submissions: 2547 Points: 2

Given an array Arr of N positive integers and another number X. Determine whether or not there exist two elements in Arr whose sum is exactly X.

Example 1:

Input:
N = 6, X = 16
Arr[] = {1, 4, 45, 6, 10, 8}
Output: Yes
Explanation: Arr[3] + Arr[4] = 6 + 10 = 16

Example 2:

Input:
N = 5, X = 10
Arr[] = {1, 2, 4, 3, 6}
Output: Yes
Explanation: Arr[2] + Arr[4] = 4 + 6 = 10

Your Task:
You don't need to read input or print anything. Your task is to complete the function hasArrayTwoCandidates() which takes the array of integers arr, n and x as parameters and returns boolean denoting the answer.

Expected Time Complexity: O(N*logN)
Expected Auxiliary Space: O(1)

Constraints:
1 ≤ N ≤ 105
1 ≤ Arr[i] ≤ 105

 

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