Merge branch 'master' into patch-14

problems/0513.找树左下角的值.md

@@ -217,8 +217,36 @@ public:
 
 
 Java：
+
 ```java
+// 递归法
 class Solution {
+    private int Deep = -1;
+    private int value = 0;
+    public int findBottomLeftValue(TreeNode root) {
+        value = root.val;
+        findLeftValue(root,0);
+        return value;
+    }
+
+    private void findLeftValue (TreeNode root,int deep) {
+        if (root == null) return;
+        if (root.left == null && root.right == null) {
+            if (deep > Deep) {
+                value = root.val;
+                Deep = deep;
+            }
+        }
+        if (root.left != null) findLeftValue(root.left,deep + 1);
+        if (root.right != null) findLeftValue(root.right,deep + 1);
+    }
+}
+```
+
+```java
+//迭代法
+class Solution {
+
     public int findBottomLeftValue(TreeNode root) {
         Queue<TreeNode> queue = new LinkedList<>();
         queue.offer(root);
@@ -243,6 +271,8 @@ class Solution {
 }
 ```
 
+
+
 Python：
 
 
@@ -255,4 +285,4 @@ Go：
 * 作者微信：[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw)
 * B站视频：[代码随想录](https://space.bilibili.com/525438321)
 * 知识星球：[代码随想录](https://mp.weixin.qq.com/s/QVF6upVMSbgvZy8lHZS3CQ)
-<div align="center"><img src=../pics/公众号.png width=450 alt=> </img></div>
+<div align="center"><img src=../pics/公众号.png width=450 alt=> </img></div>