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krahets
2023-11-27 02:32:06 +08:00
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8
docs/chapter_backtracking/backtracking_algorithm.md
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@ -66,7 +66,7 @@ comments: true
```csharp title="preorder_traversal_i_compact.cs"
/* 前序遍历：例题一 */
void PreOrder(TreeNode root) {
void PreOrder(TreeNode? root) {
if (root == null) {
return;
}
@ -288,7 +288,7 @@ comments: true
```csharp title="preorder_traversal_ii_compact.cs"
/* 前序遍历：例题二 */
void PreOrder(TreeNode root) {
void PreOrder(TreeNode? root) {
if (root == null) {
return;
}
@ -588,7 +588,7 @@ comments: true
```csharp title="preorder_traversal_iii_compact.cs"
/* 前序遍历：例题三 */
void PreOrder(TreeNode root) {
void PreOrder(TreeNode? root) {
// 剪枝
if (root == null || root.val == 3) {
return;
@ -1267,7 +1267,7 @@ comments: true
// 尝试：做出选择，更新状态
MakeChoice(state, choice);
// 进行下一轮选择
Backtrack(state, new List<TreeNode> { choice.left, choice.right }, res);
Backtrack(state, [choice.left!, choice.right!], res);
// 回退：撤销选择，恢复到之前的状态
UndoChoice(state, choice);
}