每日leetcode-Palindrome Number

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

Some hints:Could negative integers be palindromes? (ie, -1)

If you are thinking of converting the integer to string, note the restriction of using extra space.

You could also try reversing an integer. However, if you have solved the problem “Reverse Integer”, you know that the reversed integer might overflow. How would you handle such case?

There is a more generic way of solving this problem.


 

这是最快的OJ题,一分钟搞定。。。。。

class Solution {
public:
    bool isPalindrome(int x) {
        int tmp=x;
        int result=0;
        while(x>0)
        {
            result=result*10+x%10;
            x=x/10;
        }
        return result==tmp;

    }
};
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