java/2016/10: add solution for part 2

I'm not entirely sure this answer is deterministic, since we are using
Hash* collections, although the test continuously passes.

Author: saser

java/src/main/java/com/github/saser/adventofcode/year2016/day10/Day10.java

@@ -31,7 +31,23 @@ private static Result solve(Reader r, int part) {
             var bot = visited61.iterator().next();
             return Result.ok(Integer.toString(bot));
         }
-        return Result.err("not implemented yet");
+        var product = 1;
+        var found = new boolean[3];
+        for (var entry : paths.entrySet()) {
+            var list = entry.getValue();
+            var output = list.get(list.size() - 1);
+            if (output >= 0 && output <= 2) {
+                if (found[output]) {
+                    continue;
+                }
+                found[output] = true;
+                product *= entry.getKey();
+            }
+            if (found[0] && found[1] && found[2]) {
+                break;
+            }
+        }
+        return Result.ok(Integer.toString(product));
     }
 
     private static class Network {

java/src/test/java/com/github/saser/adventofcode/year2016/day10/Day10Test.java

@@ -17,22 +17,13 @@ public void part1Actual() throws IOException {
         }
     }
 
-    // @Test
-    // public void part2Example() {
-    //     var input = new StringReader("");
-    //     var output = "";
-    //     var result = Day10.part2(input);
-    //     Assert.assertEquals("no error", "", result.error);
-    //     Assert.assertEquals("correct output", output, result.answer);
-    // }
-
-    // @Test
-    // public void part2Actual() throws IOException {
-    //     try (var input = new FileReader("inputs/2016/10")) {
-    //         var output = "";
-    //         var result = Day10.part2(input);
-    //         Assert.assertEquals("no error", "", result.error);
-    //         Assert.assertEquals("correct output", output, result.answer);
-    //     }
-    // }
+     @Test
+     public void part2Actual() throws IOException {
+         try (var input = new FileReader("inputs/2016/10")) {
+             var output = "143153";
+             var result = Day10.part2(input);
+             Assert.assertEquals("no error", "", result.error);
+             Assert.assertEquals("correct output", output, result.answer);
+         }
+     }
 }