Catalan numbers: Difference between revisions
Content added Content deleted
(Kotlin: init removed) |
(Kotlin version enhanced) |
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Line 1,900:
fun catI(n: Int): Double {
if (n !in catsI)
catsI[n] = Math.round(fact(2 * n) / (fact(n + 1) * fact(n))).toDouble()
return
}
Line 1,912:
for (i in 0..n - 1)
sum += catR1(i) * catR1(n - 1 - i)
sum = Math.round(sum).toDouble()
catsR1[n] = sum
return
}
fun catR2(n: Int): Double {
if (n !in catsR2)
catsR2[n] = Math.round(2.0 * (2 * (n - 1) + 1) / (n + 1) * catR2(n - 1)).toDouble()
return
}
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