refactor 124

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_124.java

@@ -7,72 +7,72 @@
 
 /**
  * 124. Binary Tree Maximum Path Sum
-
- Given a binary tree, find the maximum path sum.
- For this problem, a path is defined as any sequence of nodes from some starting node to any node
- in the tree along the parent-child connections.
-
- The path must contain at least one node and does not need to go through the root.
-
- For example:
- Given the below binary tree,
-
-   1
-  / \
- 2   3
-
- Return 6.
+ *
+ * Given a binary tree, find the maximum path sum.
+ * For this problem, a path is defined as any sequence of nodes from some starting node to any node
+ * in the tree along the parent-child connections.
+ *
+ * The path must contain at least one node and does not need to go through the root.
+ *
+ * For example:
+ * Given the below binary tree,
+ *
+ *     1
+ *    / \
+ *   2   3
+ *
+ * Return 6.
  */
 public class _124 {
 
-  public static class Solution1 {
-    int max = Integer.MIN_VALUE;
+    public static class Solution1 {
+        int max = Integer.MIN_VALUE;
 
-    public int maxPathSum(TreeNode root) {
-      dfs(root);
-      return max;
-    }
-
-    private int dfs(TreeNode root) {
-      if (root == null) {
-        return 0;
-      }
+        public int maxPathSum(TreeNode root) {
+            dfs(root);
+            return max;
+        }
 
-      int left = Math.max(dfs(root.left), 0);
-      int right = Math.max(dfs(root.right), 0);
+        private int dfs(TreeNode root) {
+            if (root == null) {
+                return 0;
+            }
 
-      max = Math.max(max, root.val + left + right);
-
-      return root.val + Math.max(left, right);
-    }
-  }
+            int left = Math.max(dfs(root.left), 0);
+            int right = Math.max(dfs(root.right), 0);
 
-  public static class Solution2 {
-    /**
-     * This one uses a map to cache, but surprisingly, it's 10% slower than all submissions compared
-     * with solution1
-     */
-    int max = Integer.MIN_VALUE;
+            max = Math.max(max, root.val + left + right);
 
-    public int maxPathSum(TreeNode root) {
-      Map<TreeNode, Integer> map = new HashMap<>();
-      dfs(root, map);
-      return max;
+            return root.val + Math.max(left, right);
+        }
     }
 
-    private int dfs(TreeNode root, Map<TreeNode, Integer> map) {
-      if (root == null) {
-        return 0;
-      }
-      if (map.containsKey(root)) {
-        return map.get(root);
-      }
-      int left = Math.max(0, dfs(root.left, map));
-      int right = Math.max(0, dfs(root.right, map));
-      max = Math.max(max, root.val + left + right);
-      int pathSum = root.val + Math.max(left, right);
-      map.put(root, pathSum);
-      return pathSum;
+    public static class Solution2 {
+        /**
+         * This one uses a map to cache, but surprisingly, it's 10% slower than all submissions compared
+         * with solution1
+         */
+        int max = Integer.MIN_VALUE;
+
+        public int maxPathSum(TreeNode root) {
+            Map<TreeNode, Integer> map = new HashMap<>();
+            dfs(root, map);
+            return max;
+        }
+
+        private int dfs(TreeNode root, Map<TreeNode, Integer> map) {
+            if (root == null) {
+                return 0;
+            }
+            if (map.containsKey(root)) {
+                return map.get(root);
+            }
+            int left = Math.max(0, dfs(root.left, map));
+            int right = Math.max(0, dfs(root.right, map));
+            max = Math.max(max, root.val + left + right);
+            int pathSum = root.val + Math.max(left, right);
+            map.put(root, pathSum);
+            return pathSum;
+        }
     }
-  }
 }