Count the Arrays

1312D1700· expert2s512 MB⌨ stdin/stdout

#combinatorics #math

Examples

Sample 1of 4

Input

3 4

Output

Sample 2of 4

Input

3 5

Output

Sample 3of 4

Input

42 1337

Output

806066790

Sample 4of 4

Input

100000 200000

Output

707899035

1312D.cpp

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Ln 11·137 BGNU C++20 (64)