Created
December 31, 2009 15:26
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def numbers=[1:[1]]; | |
def getNext(number) { | |
if((number%2)==0) { | |
return number/2; | |
} else { | |
return 3*number+1; | |
} | |
} | |
def getSequence(numbers, number) { | |
if(numbers.containsKey(number)) { | |
return numbers.get(number); | |
} else { | |
def next = getNext(number).toInteger(); | |
def seq = new Expando(); | |
seq.next = next; | |
seq.nextSequence = getSequence(numbers, next); | |
seq.number = number; | |
seq.toString = { | |
return number+ " -> "+nextSequence; | |
} | |
seq.size = ((seq.nextSequence instanceof Expando) ? seq.nextSequence.size+1 : 2); | |
numbers[number]=seq; | |
return seq; | |
} | |
} | |
long start = System.currentTimeMillis(); | |
for(i in 1..1000000) { | |
getSequence(numbers, i); | |
} | |
max = 0; | |
numbers.each { k, v-> | |
if(k>1) { | |
if(v.size>max) { | |
max = v.size; | |
} | |
} | |
} | |
println "maximum length is $max"; | |
long end = System.currentTimeMillis(); | |
println "duration "+((end-start)/1000.0)+" s"; |
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