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From PhuongHung, 1 Month ago, written in Dart.
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  1. class Solution {
  2.   int thirdMax(List<int> nums) {
  3.  nums.sort();
  4.     var data = nums.toSet();
  5.     int count = data.length;  
  6.     if (data.length <= 2) {
  7.       return data.last;
  8.     } else {
  9.       return data.elementAt(count - 3);
  10.     }
  11.   }
  12. }