2496. Maximum Value of a String in an Array

class Solution {
public:
    int maximumValue(vector<string>& strs) 
    {
        long long max = 0;
        for(int i=0; i<strs.size(); i++)
        {
            int n = 0;
            for(int j=0; j<strs[i].length(); j++)
            {
                if(strs[i][j]<='9' && strs[i][j]>='0')
                {
                    n = n*10+(strs[i][j]-'0');
                }
                else
                {
                    n = strs[i].length();
                    break;
                }
            }
                if(n > max)
                    max = n;
        }
        return max;
    }
};