### Question:
Reduction { public static boolean threeLinear(int[] A) { return threeSumNotDistinct(null); }  static boolean threeSum(int[] A); static boolean threeLinear(int[] A);  }### Answer:
@Test public void basicTest3Linear() { assertTrue(Reduction.threeLinear(new int[]{16, 8, 3})); assertFalse(Reduction.threeLinear(new int[]{2, 1, -2, -2})); assertTrue(Reduction.threeLinear(new int[]{-7, 16, 8, 3, 6})); assertTrue(Reduction.threeLinear(new int[]{-9, 2, 11, -3, 5, 87})); assertFalse(Reduction.threeLinear(new int[]{4, 2, -4, 4, -4})); assertFalse(Reduction.threeLinear(new int[]{1, -1})); }
@Test public void randomTest3Linear() { int N = 5; for (int i = 0; i < 1000; i++) { int m = i % 100; if (m == 99) N <<= 1; int[] input = Shuffler.getRandomArray(N, -m * m, m * m); assertEquals(Arrays.toString(input), threeLinear(input), Reduction.threeLinear(input)); } }