@Test public void basicTest2() { int[] arr = {1, 2, 3}; Assert.assertEquals(0, countInversion.solve(arr)); }
public int solve(int[] arr) { return -1; }
CountInversion { public int solve(int[] arr) { return -1; } }
CountInversion { public int solve(int[] arr) { return -1; }  }
CountInversion { public int solve(int[] arr) { return -1; }  int solve(int[] arr); }
CountInversion { public int solve(int[] arr) { return -1; }  int solve(int[] arr);  }