33 lines
961 B
JavaScript
33 lines
961 B
JavaScript
var swap = require('./swap');
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var isSorted = require('./isSorted');
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exports = function(arr) {
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var cmp =
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arguments.length > 1 && arguments[1] !== undefined
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? arguments[1]
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: isSorted.defComparator;
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return quickSort(arr, 0, arr.length - 1, cmp);
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};
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function quickSort(arr, left, right, cmp) {
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if (arr.length <= 1) return arr;
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var idx = partition(arr, left, right, cmp);
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if (left < idx - 1) quickSort(arr, left, idx - 1, cmp);
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if (idx < right) quickSort(arr, idx, right, cmp);
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return arr;
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}
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function partition(arr, left, right, cmp) {
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var pivot = arr[floor((right + left) / 2)];
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while (left <= right) {
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while (cmp(arr[left], pivot) < 0) left++;
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while (cmp(arr[right], pivot) > 0) right--;
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if (left <= right) {
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swap(arr, left, right);
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left++;
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right--;
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}
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}
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return left;
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}
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var floor = Math.floor;
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module.exports = exports;
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