Problem
Given a sentence S, remove all duplicate words, keeping only their first occurrence. Words are separated by spaces.
Input format
Input
input.txt
- String S (up to 100 chars, may contain multiple spaces)
Output format
Output
output.txt
- Sentence with duplicates removed
Example
input
this is is a test test
output
this is a test
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Sample cases (from the problem)
Sample Case 1
Input
this is is a test test
Expected output
this is a test
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