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Create findDuplicateNumbers.java
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findDuplicateNumbers.java

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class Solution {
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public int findDuplicate(int[] nums) {
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Arrays.sort(nums);
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for(int i=0;i<nums.length-1;i++){
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if(nums[i]==nums[i+1])
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return nums[i];
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}
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return -1;
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}
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}

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