Problem
Read a list of integers and create a singly linked list. Compute the sum of all nodes.
Input (from file `input.txt`):
- First line: integer N (1 ≤ N ≤ 10000)
- Second line: N space-separated integers
Output (to file `output.txt`):
- A single integer: the sum of the elements
Example
input.txt:
4
10 20 30 40
output.txt:
100
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