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Problem
Given two integers N and K (1 ≤ K ≤ N ≤ 9), print all increasing sequences of length K from numbers 1 to N, one per line (space-separated).
Input format
Input
input.txt
- Two integers N and K
Output format
Output
output.txt
- Each sequence, one per line
Example
input
4 2
output
1 2 1 3 1 4 2 3 2 4 3 4
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Sample cases (from the problem)
Sample Case 1
Input
4 2
Expected output
1 2 1 3 1 4 2 3 2 4 3 4
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