9. Palindrome Number(注意swap函式用法)
Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.
class Solution { public: string reverseString(string s) { int i=0,j=s.size()-1; while(i<j) { swap(s[i],s[j]); i++; j--; } return s; } bool isPalindrome(int x) { string a = to_string (x); string b = reverseString (a); return(a == b); } };
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