9. Palindrome Number

垃圾 负数都是0.。

class Solution {public:    bool isPalindrome(int x) {        if(x < 0) return false;        long long num = x;        int a[20] = {0};        int sz = 0;        while(num){            a[sz++] = num%10;            num /= 10;        }        int len = sz / 2;        while(len != 0){            if(a[sz - len] != a[len - 1])                return false;            --len;        }        return true;    }};