Good Pair
Problem Description
Given an array A and an integer B. A pair(i,j) in the array is a good pair if i!=j and (A[i]+A[j]==B). Check if any good pair exist or not.
Problem Constraints
1 <= A.size() <= 104
1 <= A[i] <= 109
1 <= B <= 109
Input Format
First argument is an integer array A.
Second argument is an integer B.
Output Format
Return 1 if good pair exist otherwise return 0.
Example Input
Input 1:
A = [1,2,3,4] B = 7
Input 2:
A = [1,2,4] B = 4
Input 3:
A = [1,2,2] B = 4
Example Output
Output 1:
1
Output 2:
0
Output 3:
1
Example Explanation
Explanation 1:
(i,j) = (3,4)
Explanation 2:
No pair has sum equal to 4.
Explanation 3:
(i,j) = (2,3)