(551)Student Attendance Record I

class Solution {
public:
    bool checkRecord(string s) {
        string s1 = "LLL";
        int countA = count(s.begin(),s.end(),'A');
        if(countA>1)    return false;
        if(s.find(s1)!=string::npos)    return false;
        return true;
    }
};