package org.example;
/**
* https://leetcode.com/problems/find-the-xor-of-numbers-which-appear-twice/description/
*/
public class Main {
public static void main(String[] args) {
}
public int duplicateNumbersXOR(int[] nums) {
int[] frequencies = new int[51];
for (int num : nums) {
frequencies[num]++;
}
int xor = 0;
for (int i = 0; i < frequencies.length; i++) {
if (frequencies[i] > 1) {
xor = xor ^ i;
}
}
return xor;
}
}
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