From 2c72abc02b9a44b9adc790dd038b085fddca001c Mon Sep 17 00:00:00 2001
From: MIracleyin <miracleyin@live.com>
Date: Fri, 16 Dec 2022 16:16:10 +0800
Subject: [PATCH 1/3] rust 968 min camera cover

---
 problems/0968.监控二叉树.md | 49 ++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/problems/0968.监控二叉树.md b/problems/0968.监控二叉树.md
index e4a0512a..4a8f9868 100644
--- a/problems/0968.监控二叉树.md
+++ b/problems/0968.监控二叉树.md
@@ -579,6 +579,55 @@ object Solution {
 }
 ```
 
+```Rust
+/// 版本一
+impl Solution {
+    pub fn min_camera_cover(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {
+        let mut res = 0;
+        if Self::traversal(&root, &mut res) == 0 {
+            res += 1;
+        }
+        res
+    }
+
+    pub fn traversal(cur: &Option<Rc<RefCell<TreeNode>>>, ans: &mut i32) -> i32 {
+        // 0 未覆盖 1 节点已设置摄像头 2 节点已覆盖
+        if let Some(node) = cur {
+            let node = node.borrow();
+
+            let left = Self::traversal(&node.left, ans);
+            let right = Self::traversal(&node.right, ans);
+
+            // 左右节点都被覆盖
+            if left == 2 && right == 2 {
+                return 0; // 无覆盖
+            }
+
+            // left == 0 right == 0 左右无覆盖
+            // left == 0 right == 1 左节点无覆盖 右节点有摄像头
+            // left == 1 right == 0 左节点有摄像头 左节点无覆盖
+            // left == 0 right == 2 左节点无覆盖 右节点有覆盖
+            // left == 2 right == 0 左节点有覆盖 右节点无覆盖
+            if left == 0 || right == 0 {
+                *ans += 1;
+                return 1;
+            }
+
+            // left == 1 right == 1 左节点有摄像头 右节点有摄像头
+            // left == 1 right == 2 左节点有摄像头 右节点覆盖
+            // left == 2 right == 1 左节点覆盖 右节点有摄像头
+            if left == 1 || right == 1 {
+                return 2; // 已覆盖
+            }
+        } else {
+            return 2;
+        }
+        -1
+    }
+}
+
+```
+
 <p align="center">
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">
   <img src="../pics/网站星球宣传海报.jpg" width="1000"/>

From dca56f0953dde88762cc707d83f7e65ae81f2cee Mon Sep 17 00:00:00 2001
From: MIracleyin <miracleyin@live.com>
Date: Fri, 16 Dec 2022 16:19:06 +0800
Subject: [PATCH 2/3] fix title rust 968

---
 problems/0968.监控二叉树.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/problems/0968.监控二叉树.md b/problems/0968.监控二叉树.md
index 4a8f9868..179102f5 100644
--- a/problems/0968.监控二叉树.md
+++ b/problems/0968.监控二叉树.md
@@ -578,7 +578,7 @@ object Solution {
   }
 }
 ```
-
+### Rust
 ```Rust
 /// 版本一
 impl Solution {

From ac18aa205aaf4278a8c037a4beb67108f905371c Mon Sep 17 00:00:00 2001
From: MIracleyin <miracleyin@live.com>
Date: Fri, 16 Dec 2022 16:57:44 +0800
Subject: [PATCH 3/3] rust 968 min camera cover version 2

---
 problems/0968.监控二叉树.md | 36 ++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/problems/0968.监控二叉树.md b/problems/0968.监控二叉树.md
index 179102f5..d897755b 100644
--- a/problems/0968.监控二叉树.md
+++ b/problems/0968.监控二叉树.md
@@ -626,6 +626,42 @@ impl Solution {
     }
 }
 
+/// 版本二
+enum NodeState {
+    NoCover = 0,
+    Camera = 1,
+    Covered = 2,
+}
+
+impl Solution {
+    pub fn min_camera_cover(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {
+        let mut res = 0;
+        let state = Self::traversal(&root, &mut res);
+        match state {
+            NodeState::NoCover => res + 1,
+            _ => res,
+        }
+    }
+
+    pub fn traversal(cur: &Option<Rc<RefCell<TreeNode>>>, ans: &mut i32) -> NodeState {
+        if let Some(node) = cur {
+            let node = node.borrow();
+            let left_state = Self::traversal(&node.left, ans);
+            let right_state = Self::traversal(&node.right, ans);
+            match (left_state, right_state) {
+                (NodeState::NoCover, _) | (_, NodeState::NoCover) => {
+                    *ans += 1;
+                    NodeState::Camera
+                }
+                (NodeState::Camera, _) | (_, NodeState::Camera) => NodeState::Covered,
+                (_, _) => NodeState::NoCover,
+            }
+        } else {
+            NodeState::Covered
+        }
+    }
+}
+
 ```
 
 <p align="center">