LeetCode Reverse Integer、Palindrome Number

Given a 32-bit signed integer, reverse digits of an integer.

Example 1:

Input: 123
Output:  321

Example 2:

Input: -123
Output: -321

Example 3:

Input: 120
Output: 21

Note:

Assume we are dealing with an environment which could only hold integers within the 32-bit signed integer range. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.

class Solution {
public:
    int reverse(int x) {
        long long res=0;
        while(x)
        {
            res=res*10+x%10;
            x/=10;
        }
        return (resINT_MAX)?0:res;
    }   
};

---

Determine whether an integer is a palindrome. Do this without extra space.

/*坑点：负数不算回文串*/
class Solution {
public:
    bool isPalindrome(int x) {
        if(x<0) return false;
        int cnt=0;
        int a[15];
        while(x)
        {
            a[cnt++]=x%10;
            x/=10;
        }
        for(int i=0;i