feat: Revised the book (#978)

* Sync recent changes to the revised Word.

* Revised the preface chapter

* Revised the introduction chapter

* Revised the computation complexity chapter

* Revised the chapter data structure

* Revised the chapter array and linked list

* Revised the chapter stack and queue

* Revised the chapter hashing

* Revised the chapter tree

* Revised the chapter heap

* Revised the chapter graph

* Revised the chapter searching

* Reivised the sorting chapter

* Revised the divide and conquer chapter

* Revised the chapter backtacking

* Revised the DP chapter

* Revised the greedy chapter

* Revised the appendix chapter

* Revised the preface chapter doubly

* Revised the figures

codes/swift/chapter_array_and_linkedlist/array.swift

@@ -31,11 +31,11 @@ func insert(nums: inout [Int], num: Int, index: Int) {
     for i in nums.indices.dropFirst(index).reversed() {
         nums[i] = nums[i - 1]
     }
-    // 将 num 赋给 index 处元素
+    // 将 num 赋给 index 处的元素
     nums[index] = num
 }
 
-/* 删除索引 index 处元素 */
+/* 删除索引 index 处的元素 */
 func remove(nums: inout [Int], index: Int) {
     // 把索引 index 之后的所有元素向前移动一位
     for i in nums.indices.dropFirst(index).dropLast() {