Problem
Given an array and a target value S, determine whether any two distinct elements sum to S.
Input format
Input
input.txt
- First line: integers N and S (1 ≤ N ≤ 100) - Second line: N space-separated integers
Output format
Output
output.txt
- "YES" if such a pair exists, otherwise "NO"
Example
input
5 9 2 4 3 5 7
output
YES
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Sample cases (from the problem)
Sample Case 1
Input
5 9 2 4 3 5 7
Expected output
YES
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