CPLIB_MATH_COMBINATION = 1

proc initCombination[ModInt](max_N: int): Combination_Type[ModInt]

proc ncr[ModInt](c: Combination_Type[ModInt]; n, r: int): ModInt

proc nhr[ModInt](c: Combination_Type[ModInt]; n, r: int): ModInt

proc npr[ModInt](c: Combination_Type[ModInt]; n, r: int): ModInt