Problem
Given a non-negative integer N, print its binary representation using recursion. Do not print leading zeros.
Input format
Input
input.txt
- A single integer N (0 ≤ N ≤ 10000)
Output format
Output
output.txt
- The binary representation of N as a string
Example
input
10
output
1010
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Sample cases (from the problem)
Sample Case 1
Input
10
Expected output
1010
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