class Solution
{
public:
    int strToInt(string str)
    {
        int len = str.length();
        int k = 0;
        while((k < len) && (str[k] == ' '))
            k ++;
        long long int res = 0;
        int mins = 1;
        if(k < len)
        {
            if(str[k] == '-')
            {
                mins = -1;
                k ++;
            }
            else if(str[k] == '+')
                k ++;
        }
        while((k < len) && (str[k] >= '0' && str[k] <= '9'))
        {
            res = (res * 10) + (str[k] - '0');
            if(res > 1e+11)
                break;
            k ++;
        }
        res = res * mins;
        if(res > INT_MAX)
            res = INT_MAX;
        if(res < INT_MIN)
            res = INT_MIN;
        return res;
    }
};