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import java.lang.*;
import java.util.*;
class LongestPalindrome {
public static String longestPalindrome(String s) {
// TODO: check if s length is 0 or 1
// TODO: find simpler solution
s = s.toLowerCase();
char[] arr = s.toCharArray();
String ans = null;
int i = 0;
int j = 0;
int max = 0;
// Odd case: "aba"
for (int a = 1; a < arr.length - 1; a++) {
i = a - 1;
j = a + 1;
while (i >= 0 && j < arr.length) {
if (arr[i] == arr[j]) {
if (j - i > max) {
max = j - i;
ans = s.substring(i, j + 1);
}
i--;
j++;
} else {
break;
}
}
}
// Even case: "abba"
for (i = 0, j = i + 1; i < arr.length - 1; i++) {
while (i >= 0 && j < arr.length) {
if (arr[i] == arr[j]) {
if (j - i > max) {
max = j - i;
ans = s.substring(i, j + 1);
}
i--;
j++;
} else {
break;
}
}
}
return ans;
}
public static void main(String[] args) {
String s = "kl;fadsjf;dalscbbciuporeqwrpo";
System.out.println(longestPalindrome(s));
}
}
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