Height Checker LeetCode solution in Java

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class Solution {
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  public int heightChecker(int[] heights) {
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    int[] dupheights = Arrays.copyOfRange(heights, 0, heights.length);
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    Arrays.sort(dupheights);
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    int count = 0;
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    for (int i = 0; i < heights.length; i++) {
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      if (heights[i] != dupheights[i]) {
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        count++;
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      }
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    }
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    return count;
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  }
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}