diff --git "a/leetcode3/\354\227\274\355\230\234\354\240\225/682. Baseball Game.java" "b/leetcode3/\354\227\274\355\230\234\354\240\225/682. Baseball Game.java"
new file mode 100644
index 00000000..860ac05b
--- /dev/null
+++ "b/leetcode3/\354\227\274\355\230\234\354\240\225/682. Baseball Game.java"	
@@ -0,0 +1,26 @@
+// O(n)
+
+class Solution {
+    public int calPoints(String[] operations) {
+        List<Integer> list = new ArrayList<>();
+        for (int i = 0; i<operations.length; i++) {
+            int now = list.size()-1;
+            switch (operations[i]) {
+                case "C":
+                    list.remove(now);
+                    break;
+                case "D":
+                    list.add(list.get(now) * 2);
+                    break;
+                case "+":
+                    list.add(list.get(now) + list.get(now-1));
+                    break;
+                default:
+                    list.add(Integer.parseInt(operations[i]));
+            }
+        }
+        int sum = 0;
+        for (int l : list) sum += l;
+        return sum;
+    }
+}