contents: reorganize algo cheatsheet

website/sidebars.js

@@ -54,24 +54,52 @@ module.exports = {
     {
       'Algorithms study cheatsheets': [
         'algorithms/study-cheatsheet',
-        'algorithms/array',
-        'algorithms/string',
-        'algorithms/hash-table',
-        'algorithms/recursion',
-        'algorithms/sorting-searching',
-        'algorithms/matrix',
-        'algorithms/linked-list',
-        'algorithms/queue',
-        'algorithms/stack',
-        'algorithms/tree',
-        'algorithms/graph',
-        'algorithms/heap',
-        'algorithms/trie',
-        'algorithms/interval',
-        'algorithms/dynamic-programming',
-        'algorithms/binary',
-        'algorithms/math',
-        'algorithms/geometry',
+        {
+          type: 'category',
+          label: 'Basics',
+          collapsible: false,
+          items: [
+            'algorithms/array',
+            'algorithms/string',
+            'algorithms/hash-table',
+            'algorithms/recursion',
+            'algorithms/sorting-searching',
+          ],
+        },
+        {
+          type: 'category',
+          label: 'Data structures',
+          collapsible: false,
+          items: [
+            'algorithms/matrix',
+            'algorithms/linked-list',
+            'algorithms/queue',
+            'algorithms/stack',
+            'algorithms/interval',
+          ],
+        },
+        {
+          type: 'category',
+          label: 'Advanced data structures',
+          collapsible: false,
+          items: [
+            'algorithms/tree',
+            'algorithms/graph',
+            'algorithms/heap',
+            'algorithms/trie',
+          ],
+        },
+        {
+          type: 'category',
+          label: 'Additional',
+          collapsible: false,
+          items: [
+            'algorithms/dynamic-programming',
+            'algorithms/binary',
+            'algorithms/math',
+            'algorithms/geometry',
+          ],
+        },
       ],
     },
     {