Given an integer x, return true if x is a palindrome, and false otherwise.
Example 1:
Input: x = 121 Output: true Explanation: 121 reads as 121 from left to right and from right to left.
Example 2:
Input: x = -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: x = 10 Output: false Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
Constraints:
-231 <= x <= 231 - 1
class Solution {
public boolean isPalindrome(int x) {
if(x<0){
return false ;
}
int n = x ;
int revNum = 0 ;
while(n>0){
int d = n%10 ;
revNum = revNum*10 + d ;
n = n/10 ;
}
if(revNum == x ){
return true ;
}
else{
return false ;
}
}
}
def isPalindrome(x: int) -> bool:
if x < 0:
return False
x_str = str(x)
return x_str == x_str[::-1]
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