add exercises

data/tree.json

@@ -844,6 +844,16 @@
                       ],
                       "children": []
                     }
+                  },
+                  {
+                    "螺旋折线": {
+                      "node_id": "algorithm-95fa7ac83e7d4750b7aae3d4c2b0e797",
+                      "keywords": [
+                        "蓝桥杯",
+                        "螺旋折线"
+                      ],
+                      "children": []
+                    }
                   }
                 ]
               }