problem
solution:
没想到使用vector!
class Solution { public: int calPoints(vector<string>& ops) { vector<int> v; for(auto ch:ops) { if(ch=="+") v.push_back(v.back()+v[v.size()-2]);//err. else if(ch=="D") v.push_back(2*v.back()); else if(ch=="C") v.pop_back(); else v.push_back(stoi(ch)); } return accumulate(v.begin(), v.end(), 0);//err. } };
参考
1. Leetcode_easy_682. Baseball Game;
2. Grandyang;
完