Merge pull request #4275 from IDON-TEXIST/master

fix typo in euler tour trees json

Author: SansPapyrus683

content/4_Gold/Tree_Euler.problems.json

@@ -135,13 +135,13 @@
       "uniqueId": "cf-1051F",
       "name": "The Shortest Statement",
       "url": "https://codeforces.com/contest/1051/problem/F",
-      "source": "AC",
+      "source": "CF",
       "difficulty": "Normal",
       "isStarred": false,
       "tags": ["Euler Tour"],
       "solutionMetadata": {
         "kind": "autogen-label-from-site",
-        "site": "AC"
+        "site": "CF"
       }
     },
     {