题目
Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000.
Input: "babad"
Output: "bab"
Note: "aba" is also a valid answer.
Input: "cbbd"
Output: "bb"
public String longestPalindrome(String s) {
int start = 0, end = 0;
for (int i = 0; i < s.length(); i++) {
int len1 = expandAroundCenter(s, i, i);
int len2 = expandAroundCenter(s, i, i + 1);
int len = Math.max(len1, len2);
if (len > end - start) {
start = i - (len - 1) / 2;
end = i + len / 2;
}
}
return s.substring(start, end + 1);
}
private int expandAroundCenter(String s, int left, int right) {
int L = left, R = right;
while (L >= 0 && R < s.length() && s.charAt(L) == s.charAt(R)) {
L--;
R++;
}
return R - L - 1;
}
答案如上,求解为什么需要2个方法 int len1 = expandAroundCenter(s, i, i);
int len2 = expandAroundCenter(s, i, i + 1);得到回文数,还有 最后一行为什么是rteurn R - L - 1 ,而不是R - L