intro sorted sets: fix problem ordering

Author: bqi343

content/4_Gold/Intro_Sorted_Sets.problems.json

@@ -13,12 +13,24 @@
         "kind": "internal"
       }
     },
+    {
+      "uniqueId": "ys-DEPQ",
+      "name": "Double-Ended Priority Queue",
+      "url": "https://judge.yosupo.jp/problem/double_ended_priority_queue",
+      "source": "YS",
+      "difficulty": "Easy",
+      "isStarred": false,
+      "tags": ["Sorted Set"],
+      "solutionMetadata": {
+        "kind": "none"
+      }
+    },
     {
       "uniqueId": "cses-1163",
       "name": "Traffic Lights",
       "url": "https://cses.fi/problemset/task/1163",
       "source": "CSES",
-      "difficulty": "Normal",
+      "difficulty": "Easy",
       "isStarred": true,
       "tags": ["Sorted Set"],
       "solutionMetadata": {
@@ -53,18 +65,6 @@
     }
   ],
   "general": [
-    {
-      "uniqueId": "ys-DEPQ",
-      "name": "Double-Ended Priority Queue",
-      "url": "https://judge.yosupo.jp/problem/double_ended_priority_queue",
-      "source": "YS",
-      "difficulty": "Easy",
-      "isStarred": false,
-      "tags": ["Sorted Set"],
-      "solutionMetadata": {
-        "kind": "none"
-      }
-    },
     {
       "uniqueId": "usaco-763",
       "name": "Milk Measurement",