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public class LongestPalindrome {

public int longestPalindrome(String s) {

int len = s.length();

int CHAR_MAX = 256;

int[] f = new int[CHAR_MAX];

for (int i = 0; i < len; i++) {

f[s.charAt(i)]++;

}

int count = 0;

for (int i = 0; i < CHAR_MAX; i++) {

count += ((f[i] >> 1) << 1);

}

if (count < len) {

count++;

}

return count;

}

}