class Solution {
public:
    int strToInt(string str) {
       int k=0;
       int f=1;
       while(k<str.size()&&str[k]==' ') k++;

       if(k<str.size()&&str[k]=='-'){
            f=-1;
            k++;
       }

       if(str[k]=='+') k++;

       long long res=0;

       while(k<str.size()&&str[k]>='0'&&str[k]<='9'){
           res=res*10+str[k]-'0';
           if(res>INT_MAX) break;
           k++;
       }
       res=res*f;
       if(res>INT_MAX) return INT_MAX;
       else if(res<INT_MIN) return INT_MIN;

       return res;
   }
};