LC 9. 回文数

代码 :

class Solution {
public:
    bool isPalindrome(int x) {
        if(x < 0) return false; 
        long long res = 0;
        int tmp = x; 
        while(x) {
            res = res * 10 + x % 10;
            x /= 10;
        }
        return tmp == res;
    }
};

class Solution {
public:
    bool isPalindrome(int x) {
        string res = to_string(x);
        auto s = res;
        reverse(res.begin(), res.end());
        return res == s; 
    }
};