feat: add Swift codes for backtracking_algorithm article (#480)

* fix: compile error * fix: package define * feat: add Swift codes for backtracking_algorithm article
2026-09-03 21:57:14 +00:00 · 2023-05-03 18:45:43 +08:00
parent ca76336a55
commit 561ef20462
7 changed files with 241 additions and 6 deletions
@@ -0,0 +1,43 @@
+/**
+ * File: preorder_traversal_i_compact.swift
+ * Created Time: 2023-04-30
+ * Author: nuomi1 (nuomi1@qq.com)
+ */
+
+import utils
+
+var res: [TreeNode] = []
+
+/* 前序遍历：例题一 */
+func preOrder(root: TreeNode?) {
+    guard let root = root else {
+        return
+    }
+    if root.val == 7 {
+        // 记录解
+        res.append(root)
+    }
+    preOrder(root: root.left)
+    preOrder(root: root.right)
+}
+
+@main
+enum PreorderTraversalICompact {
+    /* Driver Code */
+    static func main() {
+        let root = TreeNode.listToTree(list: [1, 7, 3, 4, 5, 6, 7])
+        print("\n初始化二叉树")
+        PrintUtil.printTree(root: root)
+
+        // 前序遍历
+        res = []
+        preOrder(root: root)
+
+        print("\n输出所有值为 7 的节点")
+        var vals: [Int] = []
+        for node in res {
+            vals.append(node.val)
+        }
+        print(vals)
+    }
+}