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krahets
2024-03-18 03:11:07 +08:00
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36
docs/chapter_backtracking/backtracking_algorithm.md
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@ -428,7 +428,11 @@ comments: true
```rust title="preorder_traversal_ii_compact.rs"
/* 前序遍历：例题二 */
fn pre_order(res: &mut Vec<Vec<Rc<RefCell<TreeNode>>>>, path: &mut Vec<Rc<RefCell<TreeNode>>>, root: Option<Rc<RefCell<TreeNode>>>) {
fn pre_order(
res: &mut Vec<Vec<Rc<RefCell<TreeNode>>>>,
path: &mut Vec<Rc<RefCell<TreeNode>>>,
root: Option<Rc<RefCell<TreeNode>>>,
) {
if root.is_none() {
return;
}
@ -442,7 +446,7 @@ comments: true
pre_order(res, path, node.borrow().left.clone());
pre_order(res, path, node.borrow().right.clone());
// 回退
path.remove(path.len() - 1);
path.remove(path.len() - 1);
}
}
```
@ -738,7 +742,11 @@ comments: true
```rust title="preorder_traversal_iii_compact.rs"
/* 前序遍历：例题三 */
fn pre_order(res: &mut Vec<Vec<Rc<RefCell<TreeNode>>>>, path: &mut Vec<Rc<RefCell<TreeNode>>>, root: Option<Rc<RefCell<TreeNode>>>) {
fn pre_order(
res: &mut Vec<Vec<Rc<RefCell<TreeNode>>>>,
path: &mut Vec<Rc<RefCell<TreeNode>>>,
root: Option<Rc<RefCell<TreeNode>>>,
) {
// 剪枝
if root.is_none() || root.as_ref().unwrap().borrow().val == 3 {
return;
@ -753,7 +761,7 @@ comments: true
pre_order(res, path, node.borrow().left.clone());
pre_order(res, path, node.borrow().right.clone());
// 回退
path.remove(path.len() - 1);
path.remove(path.len() - 1);
}
}
```
@ -1558,7 +1566,10 @@ comments: true
}
/* 记录解 */
fn record_solution(state: &mut Vec<Rc<RefCell<TreeNode>>>, res: &mut Vec<Vec<Rc<RefCell<TreeNode>>>>) {
fn record_solution(
state: &mut Vec<Rc<RefCell<TreeNode>>>,
res: &mut Vec<Vec<Rc<RefCell<TreeNode>>>>,
) {
res.push(state.clone());
}
@ -1578,7 +1589,11 @@ comments: true
}
/* 回溯算法：例题三 */
fn backtrack(state: &mut Vec<Rc<RefCell<TreeNode>>>, choices: &mut Vec<Rc<RefCell<TreeNode>>>, res: &mut Vec<Vec<Rc<RefCell<TreeNode>>>>) {
fn backtrack(
state: &mut Vec<Rc<RefCell<TreeNode>>>,
choices: &mut Vec<Rc<RefCell<TreeNode>>>,
res: &mut Vec<Vec<Rc<RefCell<TreeNode>>>>,
) {
// 检查是否为解
if is_solution(state) {
// 记录解
@ -1591,7 +1606,14 @@ comments: true
// 尝试：做出选择，更新状态
make_choice(state, choice.clone());
// 进行下一轮选择
backtrack(state, &mut vec![choice.borrow().left.clone().unwrap(), choice.borrow().right.clone().unwrap()], res);
backtrack(
state,
&mut vec![
choice.borrow().left.clone().unwrap(),
choice.borrow().right.clone().unwrap(),
],
res,
);
// 回退：撤销选择，恢复到之前的状态
undo_choice(state, choice.clone());
}