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za1275952454 · web-flow · commit 3fdaf135bd09 · 2018-12-04T21:34:19.000+08:00
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diff --git a/2018.12.04-leetcode101/fish.md b/2018.12.04-leetcode101/fish.md
@@ -0,0 +1,58 @@
+```
+class Solution {
+    public boolean isSymmetric(TreeNode treeNode) {
+        if (treeNode == null) {
+            return true;
+        }else {
+            return isSymmetric(treeNode.getLeft(), treeNode.getRight());
+        }
+    }
+
+    public boolean isSymmetric(TreeNode left, TreeNode right) {
+        if (left == null && right == null) {
+            return true;
+        }
+        if (left == null || right == null) {
+            return false;
+        }
+        if (left.getVal() != right.getVal()) {
+            return false;
+        }
+        return isSymmetric(left.getLeft(), right.getRight()) && isSymmetric(left.getRight(), right.getLeft());
+    }
+}
+class TreeNode{
+    private int val;
+    private TreeNode left;
+    private TreeNode right;
+
+    public TreeNode(int val, TreeNode left, TreeNode right) {
+        this.val = val;
+        this.left = left;
+        this.right = right;
+    }
+
+    public int getVal() {
+        return val;
+    }
+
+    public void setVal(int val) {
+        this.val = val;
+    }
+
+    public TreeNode getLeft() {
+        return left;
+    }
+
+    public void setLeft(TreeNode left) {
+        this.left = left;
+    }
+
+    public TreeNode getRight() {
+        return right;
+    }
+
+    public void setRight(TreeNode right) {
+        this.right = right;
+    }
+}
