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Problem136.java

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class Problem136 {

public static void main(String[] args) {

int[] nums = {2, 2, 3, 4, 3};

System.out.println(new Problem136().singleNumber(nums));

}

public int singleNumber(int[] nums) {

if (nums.length == 1) {

return nums[0];

}

int res = nums[0];

for (int i = 1; i < nums.length; i++) {

res = nums[i] ^ res;

}

return res;

}

}