2124. Check if All A's Appears Before All B's.cpp

class Solution
{
public:
    bool checkString(string s)
    {
        for (int i = 0; i < s.length() - 1; ++i)
        {
            if (s[i] == 'b' && s[i + 1] == 'a')
                return false;
        }
        return true;
    }
};