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Implemented cycle sort algorithm
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62
Sorts/cycleSort.js
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62
Sorts/cycleSort.js
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/*
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Wikipedia says: Cycle sort is an in-place, unstable sorting algorithm,
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a comparison sort that is theoretically optimal in terms of the total
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number of writes to the original array, unlike any other in-place sorting
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algorithm. It is based on the idea that the permutation to be sorted can
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be factored into cycles, which can individually be rotated to give a sorted result.
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*/
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function cycleSort(list) {
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let writes = 0;
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for (let cycleStart = 0; cycleStart < list.length; cycleStart++) {
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let value = list[cycleStart];
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let position = cycleStart;
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// search position
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for (let i = cycleStart+1; i < list.length; i++) {
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if (list[i] < value) {
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position++;
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}
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}
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// if its the same continue
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if (position == cycleStart) {
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continue;
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}
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while (value == list[position]) {
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position++;
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}
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let oldValue = list[position];
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list[position] = value;
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value = oldValue;
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writes++;
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// rotate the rest
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while (position != cycleStart) {
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position = cycleStart;
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for (let i = cycleStart +1; i < list.length; i++) {
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if (list[i] < value) {
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position++;
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}
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}
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while (value == list[position]) {
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position++;
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}
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let oldValueCycle = list[position];
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list[position] = value;
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value = oldValueCycle;
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writes++;
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}
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}
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return writes;
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}
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let arrOrignal = [5, 6, 7, 8, 1, 2,12, 14];
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//Array before Sort
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console.log(arrOrignal);
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cycleSort(arrOrignal);
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//Array after sort
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console.log(arrOrignal);
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