mirror of
https://github.com/youngyangyang04/leetcode-master.git
synced 2025-07-07 15:45:40 +08:00
@ -577,6 +577,91 @@ object Solution {
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result
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}
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}
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```
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### Rust
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```Rust
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/// 版本一
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impl Solution {
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pub fn min_camera_cover(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {
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let mut res = 0;
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if Self::traversal(&root, &mut res) == 0 {
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res += 1;
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}
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res
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}
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pub fn traversal(cur: &Option<Rc<RefCell<TreeNode>>>, ans: &mut i32) -> i32 {
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// 0 未覆盖 1 节点已设置摄像头 2 节点已覆盖
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if let Some(node) = cur {
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let node = node.borrow();
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let left = Self::traversal(&node.left, ans);
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let right = Self::traversal(&node.right, ans);
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// 左右节点都被覆盖
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if left == 2 && right == 2 {
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return 0; // 无覆盖
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}
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// left == 0 right == 0 左右无覆盖
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// left == 0 right == 1 左节点无覆盖 右节点有摄像头
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// left == 1 right == 0 左节点有摄像头 左节点无覆盖
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// left == 0 right == 2 左节点无覆盖 右节点有覆盖
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// left == 2 right == 0 左节点有覆盖 右节点无覆盖
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if left == 0 || right == 0 {
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*ans += 1;
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return 1;
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}
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// left == 1 right == 1 左节点有摄像头 右节点有摄像头
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// left == 1 right == 2 左节点有摄像头 右节点覆盖
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// left == 2 right == 1 左节点覆盖 右节点有摄像头
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if left == 1 || right == 1 {
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return 2; // 已覆盖
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}
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} else {
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return 2;
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}
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-1
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}
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}
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/// 版本二
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enum NodeState {
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NoCover = 0,
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Camera = 1,
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Covered = 2,
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}
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impl Solution {
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pub fn min_camera_cover(root: Option<Rc<RefCell<TreeNode>>>) -> i32 {
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let mut res = 0;
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let state = Self::traversal(&root, &mut res);
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match state {
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NodeState::NoCover => res + 1,
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_ => res,
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}
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}
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pub fn traversal(cur: &Option<Rc<RefCell<TreeNode>>>, ans: &mut i32) -> NodeState {
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if let Some(node) = cur {
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let node = node.borrow();
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let left_state = Self::traversal(&node.left, ans);
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let right_state = Self::traversal(&node.right, ans);
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match (left_state, right_state) {
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(NodeState::NoCover, _) | (_, NodeState::NoCover) => {
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*ans += 1;
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NodeState::Camera
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}
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(NodeState::Camera, _) | (_, NodeState::Camera) => NodeState::Covered,
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(_, _) => NodeState::NoCover,
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}
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} else {
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NodeState::Covered
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}
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}
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}
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```
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<p align="center">
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Reference in New Issue
Block a user