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add solution: Missing Number
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missing-number/Gotprgmer.java

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// 단순하게 정렬해서 일치하지 않으면 출력하고 리스트를 벗어나면 그대로 checkNum을 출력하는 방식
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// 시간복잡도 : O(NlogN)
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// 공간복잡도 : O(1)
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class SolutionGotprgmer {
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public int missingNumber(int[] nums) {
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Arrays.sort(nums);
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int checkNum = 0;
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for(int i=0;i<nums.length;i++){
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if(nums[i] != checkNum){
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return checkNum;
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}
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checkNum += 1;
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}
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return checkNum;
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}
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}

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