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add No217
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leetcode/Array/No217.java

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class Solution {
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public boolean containsDuplicate(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 true;
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}
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}
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return false;
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}
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}

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