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1. /* * Bai 1 */ /* * c1 */ public static LinkedList<Integer> sapXep(int[] a){ LinkedList<Integer> result = new LinkedList<>(); for(int i=0; i<a.length; i++){ result.add(a[i]); } Collections.sort(result); return result; } /* * Bai 2 */ public static int sizeIter(Iterator<Integer> iter){ int result = 0; while(iter.hasNext()){ iter.next(); result++; } return result; } public static int random(Iterator<Integer> iter){ int result = 0; Iterator<Integer> another = iter; int size = Test.sizeIter(another); int randomIndex = new Random().nextInt(size);

2. int i = 0; while(iter.hasNext()){ if(i == randomIndex){ result = iter.next(); break; }else{ iter.next(); i++; } } return result; } /*Bai3 * */ public static ArrayList<Integer> duongCheo(int[][] a){ ArrayList<Integer> result = new ArrayList<>(); if(a.length == a[0].length){ for(int i =0; i<a.length; i++){ result.add(a[i][i]); } }else{ result = null; } return result; }

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