Problem
Given an array of N integers (1 ≤ N ≤ 18), determine if there exists a non-empty subset whose sum is exactly K.
Input format
Input
input.txt
- The first line contains N and K - The second line contains N integers
Output format
Output
output.txt
- "YES" or "NO"
Example
input
4 6 3 2 5 1
output
YES
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Sample cases (from the problem)
Sample Case 1
Input
4 6 3 2 5 1
Expected output
YES
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