Two Equal Piles
Can the multiset be split into two piles with equal sums?
Input: the first line has N; the second line has N positive integers.
Output: YES or NO.
Constraints:
- 1 ≤ N ≤ 100
- 1 ≤ ai ≤ 100
Sample Tests
Input 1
4 1 5 11 7
Output 1
YES
Input 2
3 1 2 5
Output 2
NO
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