feat: add typescript solution to lc problem: No.0876.Middle of the Li…

solution/0800-0899/0876.Middle of the Linked List/README.md

@@ -91,6 +91,31 @@ class Solution {
 }
 ```
 
+### **TypeScript**
+
+```ts
+/**
+ * Definition for singly-linked list.
+ * class ListNode {
+ *     val: number
+ *     next: ListNode | null
+ *     constructor(val?: number, next?: ListNode | null) {
+ *         this.val = (val===undefined ? 0 : val)
+ *         this.next = (next===undefined ? null : next)
+ *     }
+ * }
+ */
+
+function middleNode(head: ListNode | null): ListNode | null {
+    let fast = head, slow = head;
+    while (fast != null && fast.next != null) {
+        fast = fast.next.next;
+        slow = slow.next;
+    }
+    return slow;
+};
+```
+
 ### **...**
 
 ```

solution/0800-0899/0876.Middle of the Linked List/README_EN.md

@@ -99,6 +99,31 @@ class Solution {
 }
 ```
 
+### **TypeScript**
+
+```ts
+/**
+ * Definition for singly-linked list.
+ * class ListNode {
+ *     val: number
+ *     next: ListNode | null
+ *     constructor(val?: number, next?: ListNode | null) {
+ *         this.val = (val===undefined ? 0 : val)
+ *         this.next = (next===undefined ? null : next)
+ *     }
+ * }
+ */
+
+function middleNode(head: ListNode | null): ListNode | null {
+    let fast = head, slow = head;
+    while (fast != null && fast.next != null) {
+        fast = fast.next.next;
+        slow = slow.next;
+    }
+    return slow;
+};
+```
+
 ### **...**
 
 ```

solution/0800-0899/0876.Middle of the Linked List/Solution.ts

@@ -0,0 +1,20 @@
+/**
+ * Definition for singly-linked list.
+ * class ListNode {
+ *     val: number
+ *     next: ListNode | null
+ *     constructor(val?: number, next?: ListNode | null) {
+ *         this.val = (val===undefined ? 0 : val)
+ *         this.next = (next===undefined ? null : next)
+ *     }
+ * }
+ */
+
+ function middleNode(head: ListNode | null): ListNode | null {
+    let fast = head, slow = head;
+    while (fast != null && fast.next != null) {
+        fast = fast.next.next;
+        slow = slow.next;
+    }
+    return slow;
+};