添加Go语言题解

animation-simulation/二叉树/二叉树的前序遍历(栈).md

@@ -49,10 +49,10 @@ class Solution {
     public List<Integer> preorderTraversal(TreeNode root) {
         List<Integer> list = new ArrayList<>();
         Stack<TreeNode> stack = new Stack<>();
-        if (root == null)  return list;
+        if (root == null)  return list;   
         stack.push(root);
         while (!stack.isEmpty()) {
-            TreeNode temp = stack.pop();
+            TreeNode temp = stack.pop();        
             if (temp.right != null) {
                 stack.push(temp.right);
             }
@@ -95,3 +95,27 @@ class Solution {
     }
 }
 ```
+
+Go Code:
+
+```go
+func preorderTraversal(root *TreeNode) []int {
+    res := []int{}
+    if root == nil {
+        return res
+    }
+    stk := []*TreeNode{root}
+    for len(stk) != 0 {
+        temp := stk[len(stk) - 1]
+        stk = stk[: len(stk) - 1]
+        if temp.Right != nil {
+            stk = append(stk, temp.Right)
+        }
+        if temp.Left != nil {
+            stk = append(stk, temp.Left)
+        }
+        res = append(res, temp.Val)
+    }
+    return res
+}
+```