docs(chap7): add chap7 docs

code/linked-list/odd-even-linked-list.ts

@@ -4,20 +4,19 @@
  * @returns
  * @link https://leetcode.cn/problems/odd-even-linked-list/
  */
-const oddEvenList = function(head) {
-  if(head == null) {
-      return head;
+const oddEvenList = function (head) {
+  if (head == null) {
+    return head;
   }
 
-  let evenHead = head.next;
+  const evenHead = head.next;
   let odd = head;
   let even = evenHead;
-  while(even != null && even.next != null) {
-      odd.next = even.next
-      odd = odd.next;
-      even.next = odd.next;
-      even = even.next;
-
+  while (even != null && even.next != null) {
+    odd.next = even.next;
+    odd = odd.next;
+    even.next = odd.next;
+    even = even.next;
   }
 
   odd.next = evenHead;

code/linked-list/palindrome-linked-list.ts

@@ -17,25 +17,25 @@
 const isPalindromeLinked = function (head) {
   let fast = head,
     slow = head;
-  let dumy, q;
+  let dummy, q;
   while (fast && fast.next) {
     q = slow;
     slow = slow.next;
     fast = fast.next.next;
-    q.next = dumy; // 反转slow指针的链表
-    dumy = q;
+    q.next = dummy; // 反转slow指针的链表
+    dummy = q;
   }
 
   if (fast) {
     // 奇数，fast.next不存在
     slow = slow.next;
   }
 
-  while (dumy && slow) {
-    if (dumy.val !== slow.val) {
+  while (dummy && slow) {
+    if (dummy.val !== slow.val) {
       return false;
     }
-    dumy = dumy.next;
+    dummy = dummy.next;
     slow = slow.next;
   }
 

docs/zh/guide/book/chap7.mdx

@@ -0,0 +1 @@
+# 第7章 集合

modern.config.ts

@@ -44,6 +44,7 @@ function getSidebarConfig(lang: 'zh' | 'en') {
           getLink('/guide/book/chap4'),
           getLink('/guide/book/chap5'),
           getLink('/guide/book/chap6'),
+          getLink('/guide/book/chap7'),
           getLink('/guide/book/recursive'),
           getLink('/guide/book/heap'),
           getLink('/guide/book/chap13'),