Required Length

1681D1700· expert2s512 MB⌨ stdin/stdout

#brute force #dfs and similar #dp #hashing #shortest paths

Examples

Sample 1of 3

Input

2 1

Output

-1

Sample 2of 3

Input

3 2

Output

Sample 3of 3

Input

13 42

Output

1681D.cpp

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Ln 11·137 BGNU C++20 (64)

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