feat: Add Dart codes for chapter_backtracking and chapter_divide_and_conquer (#680)

* feat: Add Dart codes for chapter_backtracking * feat: Add Dart codes for chapter_divide_and_conquer * Format Dart Code
2026-09-17 20:17:14 +00:00 · 2023-08-10 23:48:56 +08:00
parent e97eee0e18
commit 4325974af1
19 changed files with 731 additions and 18 deletions
@@ -0,0 +1,35 @@
+/**
+ * File: preorder_traversal_i_compact.dart
+ * Created Time: 2023-08-10
+ * Author: liuyuxin (gvenusleo@gmail.com)
+ */
+
+import '../utils/print_util.dart';
+import '../utils/tree_node.dart';
+
+/* 前序遍历：例题一 */
+void preOrder(TreeNode? root, List<TreeNode> res) {
+  if (root == null) {
+    return;
+  }
+  if (root.val == 7) {
+    // 记录解
+    res.add(root);
+  }
+  preOrder(root.left, res);
+  preOrder(root.right, res);
+}
+
+/* Driver Code */
+void main() {
+  TreeNode? root = listToTree([1, 7, 3, 4, 5, 6, 7]);
+  print("\n初始化二叉树");
+  printTree(root);
+
+  // 前序遍历
+  List<TreeNode> res = [];
+  preOrder(root, res);
+
+  print("\n输出所有值为 7 的节点");
+  print(List.generate(res.length, (i) => res[i].val));
+}