Problem
Given two integers A and B (A ≤ B), find the sum of all integers between A and B (inclusive) using recursion.
Input format
Input
input.txt
- Two integers A and B (1 ≤ A ≤ B ≤ 1000)
Output format
Output
output.txt
- The sum of all integers from A to B
Example
input
3 6
output
18
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Sample cases (from the problem)
Sample Case 1
Input
3 6
Expected output
18
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