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class Solution {
public:
    bool isGoodLength(int len, string& s) {
        
    }

    string longestPalindrome(string s) {
        int l = 1; // a string of length 1 can always be a pallindrome
        int r = s.length() + 1; // it is impossible to find a string of length s.length() + 1, leave alone pallindromic

        while(r > l + 1) {
            int mid = l + (r - l) / 2;

            if(isGoodLength(mid, s)) {
                l = mid;
            } else {
                r = mid;
            }
        }
    }
};

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