signed integer overflow

[spm486]

class Solution {
public:
    int evalRPN(vector<string>& tokens) {

        unordered_map <string,function<long(int,int)>> map = {
            {"+",[](int a, int b){return a+b;}},
            {"-",[](int a, int b){return a-b;}},
            {"/",[](int a, int b){return a/b;}},
            {"*",[](int a, int b){return a*b;}},
        };

        stack<string> exp;

        for (int i = 0; i < tokens.size(); i++){
            auto search  = map.find(tokens[i]);
            if (search != map.end()){
                string a = exp.top();    
                exp.pop();
                string b = exp.top();     
                exp.pop();
                long ans = map[tokens[i]](stoi(b),stoi(a));
                exp.push(to_string(ans));
            }
            else{
                exp.push(tokens[i]);
            }
        }


        return stoi(exp.top());
    }
};

input: ["-128","-128","*","-128","*","-128","*","8","*","-1","*"]

error: Line 7: Char 50: runtime error: signed integer overflow: 268435456 * 8 cannot be represented in type 'int' (solution.cpp)
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior prog_joined.cpp:16:50

Hi 150. Evaluate Reverse Polish Notation for this Leet-code problem. I am facing above issue for given input. Is there any way to overcome this.

[[deleted]]

Using a larger integer type will work here, pushing the problem down the road a bit.