Improved tasks 401, 417.

Author: javadev

src.save/test/java/g0401_0500/s0401_binary_watch/SolutionTest.java

@@ -16,4 +16,9 @@ void readBinaryWatch() {
                                 "0:01", "0:02", "0:04", "0:08", "0:16", "0:32", "1:00", "2:00",
                                 "4:00", "8:00")));
     }
+
+    @Test
+    void readBinaryWatch2() {
+        assertThat(new Solution().readBinaryWatch(9), equalTo(Arrays.asList()));
+    }
 }

src.save/test/java/g0401_0500/s0417_pacific_atlantic_water_flow/SolutionTest.java

@@ -18,4 +18,12 @@ void pacificAtlantic() {
                 new Solution().pacificAtlantic(matrix),
                 equalTo(ArrayUtils.getLists(new int[][] {{0, 2}, {1, 1}, {1, 2}, {2, 0}})));
     }
+
+    @Test
+    void pacificAtlantic2() {
+        int[][] matrix = {{1}};
+        assertThat(
+                new Solution().pacificAtlantic(matrix),
+                equalTo(ArrayUtils.getLists(new int[][] {{0, 0}})));
+    }
 }