content fixes

Author: mamtawardhani

content/cpp/concepts/unordered-set/terms/cbegin/cbegin.md

@@ -1,99 +1,102 @@
 ---
-Title: '.cbegin()'
-Description: 'Returns a constant iterator pointing to the first element of the unordered_set.'
+Title: 'cbegin()'
+Description: 'Returns a constant iterator pointing to either the first element of the unordered_set or the first element in a specific bucket.'
 Subjects:
+  - 'Code Foundations'
   - 'Computer Science'
-  - 'Programming'
 Tags:
-  - 'C++'
-  - 'Unordered Set'
-  - 'STL'
   - 'Iterators'
+  - 'Sets'
+  - 'STL'
 CatalogContent:
   - 'learn-c-plus-plus'
   - 'paths/computer-science'
 ---
 
-The **`.cbegin()`** method returns a **constant iterator** that points to the first element in an `std::unordered_set`.
-
-The key feature of a constant iterator (`const_iterator`) is that it allows you to **read** the elements but **prevents** you from modifying them. This is a best practice when iterating over a set to ensure data integrity. Since `unordered_set` does not guarantee any specific order, the element returned by `cbegin()` depends on the internal hash table structure.
+The **`cbegin()`** method returns a constant iterator that points to the first element of an `std::unordered_set`. A constant iterator allows read-only access to elements and prevents modification. Because `unordered_set` does not maintain any defined order, the element returned by `cbegin()` depends on its internal hash table structure.
 
 ## Syntax
 
-The `.cbegin()` method is called directly on the `unordered_set` object.
+```pseudo
+unordered_set_name.cbegin(n);
+```
 
-```cpp
-unordered_set_name.cbegin();
+**Return value:**
+
+Returns a `const_iterator` (constant iterator) pointing to the first element in the `unordered_set`.
+
+Or, alternatively:
+
+```pseudo
+unordered_set_name.cbegin(n);
 ```
 
-## Parameters
+**Parameters:**
 
-The method takes no parameters.
+- `n` (size_type): The bucket index. Must be less than `bucket_count()`.
 
-## Return Value
+**Return value:**
 
-Returns a `const_iterator` (constant iterator) pointing to the first element in the `unordered_set`.
+A `const_local_iterator` pointing to the first element in bucket `n`. If the bucket is empty, the returned iterator equals `cend(n)`.
 
 ## Example
 
-This example demonstrates obtaining the starting element of an `unordered_set` using `cbegin()`. Note that attempting to modify the element pointed to by the `const_iterator` would result in a compilation error.
+This example demonstrates obtaining the starting element of an `unordered_set` using `cbegin()`:
 
 ```cpp
 #include <iostream>
 #include <string>
 #include <unordered_set>
-#include <algorithm> // Required for std::find or general use
 
 int main() {
   std::unordered_set<int> unique_numbers = {10, 5, 20, 15};
-  
-  // Get a constant iterator to the beginning
-  auto it = unique_numbers.cbegin();
 
-  // Print the value of the first element (read-only access)
-  std::cout << "The first element in the set's internal order is: " << *it << "\n";
+  auto it = unique_numbers.cbegin();
 
-  // Advance the iterator to the next element
-  // Note: The order of elements is not guaranteed!
-  ++it; 
+  std::cout << "The first element in internal order is: " << *it << "\n";
 
-  std::cout << "The second element is: " << *it << "\n";
+  ++it;
+  if (it != unique_numbers.cend()) {
+    std::cout << "The second element is: " << *it << "\n";
+  }
 
-  // The following line would cause a compile-time error:
-  // *it = 99; 
+  // *it = 99; // Error: cannot modify through const_iterator
 
   return 0;
 }
 ```
 
-Output:
+A sample output of this code is:
 
-```
+```shell
 The first element in the set's internal order is: 20
 The second element is: 5
 ```
 
-## Codebyte
+> **Note:** Attempting to modify the element pointed to by the `const_iterator` would result in a compilation error.
 
-Use the Codebyte below to access the first element of an `unordered_set` using the constant iterator returned by `.cbegin()`.
+## Codebyte Example
 
-```cpp
+In this example, the code retrieves a constant iterator for a specific bucket in the unordered_set and prints all elements stored in that bucket:
+
+```codebyte/cpp
 #include <iostream>
 #include <unordered_set>
 
 int main() {
-  std::unordered_set<std::string> colors = {"red", "green", "blue", "yellow"};
-  
-  // Use cbegin() to get the constant iterator
-  auto start_it = colors.cbegin();
-  
-  // Print the value the iterator points to
-  std::cout << "First element: " << *start_it << "\n";
-  
-  // Advance the iterator
-  ++start_it;
-  std::cout << "Second element: " << *start_it << "\n";
+  std::unordered_set<std::string> words = {"cat", "dog", "rabbit", "lion"};
+
+  size_t bucket = 0;
+
+  auto it = words.cbegin(bucket);
+  auto end = words.cend(bucket);
+
+  std::cout << "Elements in bucket " << bucket << ":\n";
+
+  for (; it != end; ++it) {
+    std::cout << "  " << *it << "\n";
+  }
 
   return 0;
 }
-```
+```