/**
 * Sort an array of integers in-place and in ascending order using counting sort.
 *
 * Time complexity: O(n + k), where n is the number of elements in arr
 * and k is the range of numbers in arr.
 *
 * Space complexity: O(n + k)
 *
 * @param arr - array of integers to sort
 */
declare const countingSort: (arr: number[]) => void;
export default countingSort;
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