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LeetCode Longest Palindromic Substring(最长回文子串)

2014-04-29 19:20 639 查看
public class Solution {
public String longestPalindrome(String s) {
int len = s.length();
if (len <= 1) return s;
boolean[][] table = new boolean[len][len];

for (int i = 0; i < len; i++) {
table[i][i] = true;
}
String longestStr = null;
int maxLen = 0;

for (int i = 0; i < len - 1; i++) {
if (s.charAt(i) == s.charAt(i + 1)) {
table[i][i + 1] = true;
longestStr = s.substring(i, i + 2);
}
}

for (int l = 3; l <= len; l++) {
for (int i = 0; i <= len - l; i++) {
int j = i + l - 1;
if (s.charAt(i) == s.charAt(j)) {
table[i][j] = table[i + 1][j - 1];
if (table[i][j] && l > maxLen) {
maxLen = l;
longestStr = s.substring(i, j + 1);
}
} else {
table[i][j] = false;
}
}
}

return longestStr;
}
}
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