9. Palindrome Number
Problem:
Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.
Example 1:
Input: 121
Output: true
Example 2:
Input: -121
Output: false
Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.
Example 3:
Input: 10
Output: false
Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
Follow up:
Coud you solve it without converting the integer to a string?
Solution:
ONE
Easy to write but slow since it generates an array.
TWO
A bit faster.
THREE
General solution. Combining 7. Reverse Integer.
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☆: .。. o(≧▽≦)o .。.:☆☆: .。. o(≧▽≦)o .。.:☆