leetcode/java/0682-baseball-game.java at main · BassemHalim/leetcode · GitHub

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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;
    }
}