class Solution {
public:
    int strToInt(string str) {
        int k = 0;
        while (k < str.size() && str[k] == ' ') k++;
        int flag = false;
        long long number = 0;
        if (str[k] == '+') k++;
        else if (str[k] == '-') k++, flag = true;
        while (k < str.size() && str[k] >= '0' && str[k] <= '9') {
            number = number * 10 + str[k] - '0';
            if (number > 1e11) break;
            k++;
        }
        if (flag) number *= (-1);
        if (number > INT_MAX) number = INT_MAX;
        else if (number < INT_MIN) number = INT_MIN;
        return number;
    }
};