Add pseudocodes to LinkedList.

Author: trekhleb

Diff for: src/data-structures/linked-list/README.md

@@ -18,107 +18,123 @@ access, such as random access, is not feasible. Arrays
 have better cache locality as compared to linked lists.
 
 ![Linked List](https://upload.wikimedia.org/wikipedia/commons/6/6d/Singly-linked-list.svg)
-## Pseudocode
+
+## Pseudocode for Basic Operations
 
 ### Insert
-    Add(value)
-        Pre: value is the value to add to the list
-        Post: value has been placed at the tail of the list
-        n ← node(value)
-        if head = ø
-          head ← n
-          tail ← n
-        else
-          tail.next ← n
-          tail ← n
-        end if
-    end Add
+
+```text
+Add(value)
+  Pre: value is the value to add to the list
+  Post: value has been placed at the tail of the list
+  n ← node(value)
+  if head = ø
+    head ← n
+    tail ← n
+  else
+    tail.next ← n
+    tail ← n
+  end if
+end Add
+```
 
 ### Search
-    Contains(head, value)
-        Pre: head is the head node in the list
-             value is the value to search for
-        Post: the item is either in the linked list, true; otherwise false
-        n ← head
-        while n = ø and n.value = value
-            n ← n.next
-        end while
-        if n = ø
-            return false
-        end if
-        return true
-    end Contains
+
+```text
+Contains(head, value)
+  Pre: head is the head node in the list
+       value is the value to search for
+  Post: the item is either in the linked list, true; otherwise false
+  n ← head
+  while n = ø and n.value = value
+    n ← n.next
+  end while
+  if n = ø
+    return false
+  end if
+  return true
+end Contains
+```
 
 ### Delete
-    Remove(head, value)
-         Pre: head is the head node in the list
-         Post: value is the value to remove from the list, true, otherwise false
-         if head = ø
-            return false
-        end if
-        n ← head
-        if n.value = value
-            if head = tail
-                head ← ø
-                tail ← ø
-            else
-                head ← head.next
-            end if
-            return true
-        end if
-        while n.next = ø and n.next.value = value
-            n ← n.next
-        end while
-        if n.next = ø
-            if n.next = tail
-                tail ← n
-            end if
-            n.next ← n.next.next
-            return true
-        end if
-        return false
-    end Remove
+
+```text
+Remove(head, value)
+  Pre: head is the head node in the list
+  Post: value is the value to remove from the list, true, otherwise false
+  if head = ø
+    return false
+  end if
+  n ← head
+  if n.value = value
+    if head = tail
+      head ← ø
+      tail ← ø
+    else
+      head ← head.next
+    end if
+    return true
+  end if
+  while n.next = ø and n.next.value = value
+    n ← n.next
+  end while
+  if n.next = ø
+    if n.next = tail
+      tail ← n
+    end if
+    n.next ← n.next.next
+    return true
+  end if
+  return false
+end Remove
+```
 
 ### Traverse
-    Traverse(head)
-        Pre: head is the head node in the list
-        Post: the items in the list have been traversed
-        n ← head
-        while n = 0
-            yield n.value
-            n ← n.next
-        end while
-    end Traverse
+
+```text
+Traverse(head)
+  Pre: head is the head node in the list
+  Post: the items in the list have been traversed
+  n ← head
+  while n = 0
+    yield n.value
+    n ← n.next
+  end while
+end Traverse
+```
 
 ### Traverse in Reverse
-    ReverseTraversal(head, tail)
-        Pre: head and tail belong to the same list
-        Post: the items in the list have been traversed in reverse order
-        if tail = ø
-           curr ← tail
-           while curr = head
-               prev ← head
-               while prev.next = curr
-                   prev ← prev.next
-               end while
-               yield curr.value
-               curr ← prev
-           end while
-           yeild curr.value
-        end if
-    end ReverseTraversal
-
-
-## Big *O*
+
+```text
+ReverseTraversal(head, tail)
+  Pre: head and tail belong to the same list
+  Post: the items in the list have been traversed in reverse order
+  if tail = ø
+     curr ← tail
+     while curr = head
+       prev ← head
+       while prev.next = curr
+           prev ← prev.next
+       end while
+       yield curr.value
+       curr ← prev
+     end while
+     yeild curr.value
+  end if
+end ReverseTraversal
+```
+
+## Complexities
 
 ### Time Complexity
-Access: *O*(*n*) \
-Search: *O*(*n*) \
-Insert: *O*(1) \
-Delete: *O*(1)
+
+| Access    | Search    | Insertion | Deletion  |
+| :-------: | :-------: | :-------: | :-------: |
+| O(n)      | O(n)      | O(1)      | O(1)      |
 
 ### Space Complexity
-*O*(*n*)
+
+O(n)
 
 ## References