220. Grid Paths
EasyCombinatoricsRecursion
Count the paths from the top-left to the bottom-right of an r×c grid moving only right or down.
Input format
A single line: r c
Output format
The number of paths.
Example 1
Input
3 3
Output
6
Example 2
Input
1 1
Output
1
Constraints
1 ≤ r, c ≤ 30
Read input from standard input and print the answer to standard output. Your code is judged against 4 test cases, most of them hidden.
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