class Solution {
public:
    int myAtoi(string str) {
        int ans=0;
        int p=0;
        if(str.length()==0)
            return 0;

        char sign=' ';
        for(int i=0;i<str.length();i++)
        {
            bool bf=false;
            while(i<str.length()&&str[i]!='+'&&str[i]!='-'&&!isdigit(str[i])) i++;
            if(i+1<str.length()&&str[i]=='+'&&isdigit(str[i+1]))
            {
                sign='+';
                i++;
            }
            if(i+1<str.length()&&str[i]=='-'&&isdigit(str[i+1]))
            {
                sign='-';
                i++;
            }
            while(i<str.length()&&isdigit(str[i]))
            {
                if(ans==INT_MAX/10)
                    return INT_MAX;
                if(ans>INT_MAX/10)
                    return INT_MIN;
                if(ans<INT_MIN/10)
                    return INT_MAX;
                ans=(ans*10)+int(str[i]-'0');
                cout<<ans<<endl;
                cout<<str[i]-'0'<<endl;
                i++;
                if(!isdigit(str[i]))
                {
                  bf=true;
                  break;
                }
                p++;

            }

            if(bf) break;
        }
        if(!isdigit(str[0])&&str[0]!='-'&&str[0]!=' '&&str[0]!='+')
            return 0;
        if(str.length()>1&&(str[0]=='+'||str[0]=='-')&&!isdigit(str[1]))
            return 0;
        if(sign=='-')
            return -ans;
        return ans;

    }
};