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Likou 682. 야구 경기

• 어레이 시뮬레이션 스택 기록 점수

•   class Solution {
    public:
        int calPoints(vector<string>& ops) {
            int res=0;
            vector<int> points;
            for(auto &op:ops)
            {
                int n = points.size();
                char c = op[0];
                if(c == '+')
                {
                    res += points[n-1] + points[n-2];
                    points.push_back(points[n-1]+points[n-2]);
                }
                else if(c == 'D')
                {
                    res += points[n-1]*2;
                    points.push_back(points[n-1]*2);
                }
                else if(c == 'C')
                {
                    res -= points[n-1];
                    points.pop_back();
                }
                else
                {
                    res += stoi(op);
                    points.push_back(stoi(op));
                }
            }
            return res;
        }
    };
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