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chapter_backtracking/backtracking_algorithm.md
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@ -290,6 +290,7 @@ comments: true
```cpp title="preorder_find_constrained_paths.cpp" ```cpp title="preorder_find_constrained_paths.cpp"
/* 前序遍历 */ /* 前序遍历 */
void preOrder(TreeNode *root) { void preOrder(TreeNode *root) {
// 剪枝
if (root == nullptr || root->val == 3) { if (root == nullptr || root->val == 3) {
return; return;
} }