Unnamed

class QS {	public static void main(String[] args) {		int[] arr = randomArray(100);		print(arr);		quicksort(arr, 0, arr.length - 1);		print(arr);		//System.out.println(check(arr));	}	static void quicksort(int[] s, int left, int right) {		if ( left < right ) {			int pivotIndex = (int)(Math.random() * (right - left)) + left + 1; //make random number from left to right			int newPivotIndex = partition(s, left, right, pivotIndex);			quicksort(s, left, newPivotIndex - 1);			quicksort(s, newPivotIndex + 1, right);		}	}	static int partition(int[] s, int left, int right, int pivotIndex) {		int pivot = s[pivotIndex];		swap(s, pivotIndex, right);		int storeIndex = left;		for (int i = left; i < right ; i++) {			if ( s[i] <= pivot ) {				swap(s, i, storeIndex);				storeIndex++;			}		}		//put pivot back		swap(s, storeIndex, right);		return storeIndex;	}	static void swap(int[] arr, int i, int j) {		int temp = arr[i];		arr[i] = arr[j];		arr[j] = temp;	}	static int[] randomArray(int n) {		int[] arr = new int[ n ];		for (int i = 0; i < arr.length; i++) {			arr[i] = (int)(Math.random() * n) + 1;		}		return arr;	}	static boolean check(int[] arr) {		for (int i = 0; i < arr.length - 1; i++) {			if ( arr[i] > arr[i+1] ) {				return false;			}		}		return true;	}	static void print(int[] arr) {		for (int i = 0; i < arr.length ;i++) {			System.out.print(arr[i] + " ");		}System.out.println();	}}