27 lines
456 B
Julia
27 lines
456 B
Julia
|
|
||
|
|
function euler0015(n::Integer)
|
||
|
|
n=big(n)
|
||
|
|
Int(div(prod(n+1:2n,1),factorial(big(n))))
|
||
|
|
end
|
||
|
|
|
||
|
|
function euler0015_2(n::Integer)
|
||
|
|
factorial(2*big(n))/factorial(big(n))^2
|
||
|
|
end
|
||
|
|
|
||
|
|
function euler0015_3(n::Integer)
|
||
|
|
n=big(n)
|
||
|
|
prod(n+1:2n,1)//factorial(big(n))
|
||
|
|
end
|
||
|
|
|
||
|
|
euler0015(3)
|
||
|
|
@time result=euler0015(big(20))
|
||
|
|
println(result)
|
||
|
|
|
||
|
|
euler0015_2(3)
|
||
|
|
@time result=euler0015_2(big(20))
|
||
|
|
println(Int(result))
|
||
|
|
|
||
|
|
euler0015_3(3)
|
||
|
|
@time result=euler0015_3(big(20))
|
||
|
|
println(result)
|