Merge pull request #1858 from gnohgnij/682-baseball-game

Create: 0682-baseball-game.java

Author: tahsintunan

java/0682-baseball-game.java

@@ -0,0 +1,29 @@
+class Solution {
+    public int calPoints(String[] operations) {
+        Stack<Integer> st = new Stack<>();
+
+        for(String op : operations) {
+            if(op.equals("+") && st.size() >= 2) {
+                int score1 = st.pop();
+                int score2 = st.peek();
+                int score3 = score1 + score2;
+                st.push(score1);
+                st.push(score3);
+            } else if(op.equals("D") && !st.isEmpty()) {
+                int score = st.peek();
+                st.push(score*2);
+            } else if(op.equals("C") && !st.isEmpty()) {
+                st.pop();
+            } else {
+                st.push(Integer.parseInt(op));
+            }
+        }
+
+        int sum = 0;
+        while(!st.isEmpty()) {
+            sum += st.pop();
+        }
+
+        return sum;
+    }
+}