Update scoreboard.json

Author: Mingguriguri

_MonthlyChallenges/scoreboard.json

@@ -29,6 +29,20 @@
         "그리디": false, 
         "구현": false
       }
+    },
+    "YoonYn9915": {
+      "그리디": [
+        
+      ], 
+      "구현": [
+        17204, 
+        17269,
+        20436
+      ],
+      "achieved": {
+        "그리디": false, 
+        "구현": false
+      }
     }
   }
 }