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class Solution {
public:
    bool validPalindrome(string s) {
        return valid(s, 0, s.length() - 1, 1);
    }
    bool valid(string& s, int i, int j, int d) {
        if (i >= j) return true;
        if (s[i] == s[j]) 
            return valid(s, i + 1, j - 1, d);
        else
            return d > 0 && (valid(s, i + 1, j, d - 1) || valid(s, i, j - 1, d - 1));
    }
};