Update #0455 分发饼干 栈 大饼干优先 & #700 二叉搜索树中的搜索 栈-遍历

problems/0455.分发饼干.md

@@ -206,8 +206,26 @@ class Solution:
 
 ```
 
-### Go
+栈 大饼干优先
+```python
+from collecion import deque
+class Solution:
+    def findContentChildren(self, g: List[int], s: List[int]) -> int:
+      #思路,饼干和孩子按从大到小排序,依次从栈中取出，若满足条件result += 1 否则将饼干栈顶元素重新返回 
+        result = 0
+        queue_g = deque(sorted(g, reverse = True))
+        queue_s = deque(sorted(s, reverse = True))
+        while queue_g and queue_s:
+            child = queue_g.popleft()
+            cookies = queue_s.popleft()
+            if child <= cookies:
+                result += 1
+            else:
+                queue_s.appendleft(cookies)
+        return result
+```
 
+### Go
 ```golang
 //排序后，局部最优
 func findContentChildren(g []int, s []int) int {

problems/0700.二叉搜索树中的搜索.md

@@ -262,6 +262,26 @@ class Solution:
         return None
 ```
 
+(方法三) 栈-遍历
+```python
+class Solution:
+    def searchBST(self, root: TreeNode, val: int) -> TreeNode:
+        stack = [root]
+        while stack:
+            node = stack.pop()
+            # 根据TreeNode的定义
+            # node携带有三类信息 node.left/node.right/node.val
+            # 找到val直接返回node 即是找到了该节点为根的子树
+            # 此处node.left/node.right/val的前后顺序可打乱
+            if node.val == val: 
+                return node
+            if node.right:
+                stack.append(node.right)
+            if node.left:
+                stack.append(node.left)
+        return None
+```
+
 
 ### Go