9 lines
242 B
Text
9 lines
242 B
Text
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fcn vanEck(startAt=0){ // --> iterator
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(startAt).walker(*).tweak(fcn(n,seen,rprev){
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prev,t := rprev.value, n - seen.find(prev,n);
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seen[prev] = n;
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rprev.set(t);
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t
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}.fp1(Dictionary(),Ref(startAt))).push(startAt)
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}
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