题目:
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.
思路:转为string看是否对称
代码:
class Solution {
public:
bool isPalindrome(int x) {
string A = to_string(x);
int left = 0, right = A.size()-1;
while(left < right){
if(A[left] != A[right]) return false;
else{
left++; right--;
}
}
return true;
}
};
本文介绍了一种通过将整数转换为字符串来判断其是否为回文数的方法。提供了具体的C++实现代码,并通过三个例子详细解释了该方法的工作原理。
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