Problem
Given an array, determine if there are three (not necessarily distinct) elements that sum to zero. Print "YES" or "NO".
Input format
Input
input.txt
- The first line contains N (1 ≤ N ≤ 100). - The second line contains N integers.
Output format
Output
output.txt
- "YES" or "NO".
Example
input
4 2 -2 1 0
output
YES
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Sample cases (from the problem)
Sample Case 1
Input
4 2 -2 1 0
Expected output
YES
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