[LeetCode] [Palindrome Number 2012-01-04]

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

if use recursive, like check the first dig and last dig, then remove them,
check the rest, it will fail when digint like "1021", when remove the first and
last one, the remaining would simply be "2", not "02".

?





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class
Solution {

public:

    bool
isPalindrome(int
x) {

        //Palindrome means 回文

        

        if(x < 0) return
false;

        if(x <= 9) return
true;

        int
t = x;

        int
n=0;

        while(t > 0)

        {

            n++;

            int
d = t%10;

            t=(t-d)/10;

        }

        

        

        int* s = new
int[n];

        t = x;

        n=0;

        while(t > 0)

        {

            int
d = t%10;

            s[n++] = d;

            t=(t-d)/10;

        }

        

        for(int
i = 0; i<n/2;i++)

        {

            if(s[i] != s[n-i-1])

            {

                return
false;

            }

        }

        return
true;

    }

};

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时间： 2024-12-05 22:47:50

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