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| public class quickSort { public static void quick(int[] arr){ if (arr == null || arr.length < 2){ return; } quick(arr,0,arr.length-1); }
private static void quick(int[] arr, int l, int r) { if (l < r){ swap(arr,l+(int)(Math.random() * ( r - l + 1)),r); int[] p = partition(arr,l,r); quick(arr,l,p[0]-1); quick(arr,p[1]+1,r); } }
private static int[] partition(int[] arr, int l, int r) {
int less = l-1; int more = r; while(l < more){ if (arr[l] < arr[r]){ swap(arr,++less,l++); }else if(arr[l] > arr[r]){ swap(arr,--more,l); }else { l++; } } swap(arr,more,r); return new int[] {less+1,more}; }
private static void swap(int[] arr, int i, int r) { int tmp = arr[i]; arr[i] = arr[r]; arr[r] = tmp; } }
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