refactor 98

fishercoder1534 · fishercoder1534 · commit 9986cf989b24 · 2020-01-24T07:24:49.000-08:00
diff --git a/src/main/java/com/fishercoder/solutions/_98.java b/src/main/java/com/fishercoder/solutions/_98.java
@@ -44,32 +44,4 @@ boolean valid(TreeNode root, Integer min, Integer max) {
         }
     }
 
-
-    public static class Solution2 {
-        public boolean isValidBST(TreeNode root) {
-            if (root == null) {
-                return true;
-            }
-            return dfs(root.left, Long.MIN_VALUE, root.val) && dfs(root.right, root.val, Long.MAX_VALUE);
-        }
-
-        private boolean dfs(TreeNode root, long minValue, long maxValue) {
-            if (root == null) {
-                return true;
-            }
-            if (root != null && (root.val <= minValue || root.val >= maxValue)) {
-                return false;
-            }
-            boolean leftResult = true;
-            boolean rightResult = true;
-            if (root.left != null) {
-                leftResult = dfs(root.left, minValue, root.val);
-            }
-            if (root.right != null) {
-                rightResult = dfs(root.right, root.val, maxValue);
-            }
-            return leftResult && rightResult;
-        }
-    }
-
 }
