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Catalan number optimised
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//'main' method must be in a class 'Rextester'. //openjdk version '11.0.5' import java.util.*; import java.lang.*; class Rextester { public static int combination(int n,int r){ int res = 1; if(r > n-r){ r = n-r; } for(int k = 0;k<r;k++){ res *= (n-k); res /= k+1; } return res; } public static int catalina(int num){ return combination(2*num,num)/(num+1); } public static void main(String args[]) { System.out.println(catalina(8)); } }
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Compilation time: 0.72 sec, absolute running time: 0.22 sec, cpu time: 0.14 sec, memory peak: 34 Mb, absolute service time: 1,01 sec
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