From 9a068272ce8fd245d0c0ef93aee689afe4ea3cce Mon Sep 17 00:00:00 2001
From: Steve2020 <841532108@qq.com>
Date: Fri, 10 Jun 2022 22:46:32 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=EF=BC=880129.=E6=B1=82?=
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---
 .../0129.求根到叶子节点数字之和.md | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/problems/0129.求根到叶子节点数字之和.md b/problems/0129.求根到叶子节点数字之和.md
index b271ca7d..a34e6921 100644
--- a/problems/0129.求根到叶子节点数字之和.md
+++ b/problems/0129.求根到叶子节点数字之和.md
@@ -289,7 +289,40 @@ var sumNumbers = function(root) {
 };
 ```
 
+TypeScript：
+
+```typescript
+function sumNumbers(root: TreeNode | null): number {
+    if (root === null) return 0;
+    let resTotal: number = 0;
+    const route: number[] = [];
+    route.push(root.val);
+    recur(root, route);
+    return resTotal;
+    function recur(node: TreeNode, route: number[]): void {
+        if (node.left === null && node.right === null) {
+            resTotal += listToSum(route);
+            return;
+        }
+        if (node.left !== null) {
+            route.push(node.left.val);
+            recur(node.left, route);
+            route.pop();
+        };
+        if (node.right !== null) {
+            route.push(node.right.val);
+            recur(node.right, route);
+            route.pop();
+        };
+    }
+    function listToSum(nums: number[]): number {
+        return Number(nums.join(''));
+    }
+};
+```
+
 C:
+
 ```c
 //sum记录总和
 int sum;