Added solution to 682

Author: Kavisha20340

leetcode/cpp/Stacks/682.cpp

@@ -0,0 +1,33 @@
+//Problem 682 : Baseball Game(using stack)
+
+class Solution {
+public:
+	int calPoints(vector<string>& ops) 
+	{
+		int result = 0; 
+		stack <int> score;
+		for (auto x : ops)
+		{
+			if (x == "C" && !score.empty()) 
+				score.pop();
+			else if(x == "D" && !score.empty())
+				score.push(2*score.top());
+			else if(x == "+" && !score.empty())
+			{
+				int top1 = score.top();
+				score.pop();
+				int top2 = score.top();
+				score.push(top1);
+				score.push((top1+top2));
+			}
+			else 
+				score.push(stoi(x)); // convert from string to int then push on stack
+		}
+		while(!score.empty())
+		{
+			result += score.top();
+			score.pop();
+		}
+		return result;
+	}
+};