Create 1929-Concatenation-of-Array.dart

Author: codewithsatyam

dart/1929-Concatenation-of-Array.dart

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+//Time Complexity: O(n)
+//Space Complexity: O(n)
+
+class Solution {
+ List<int> getConcatenation(List<int> nums) {
+  List<int> ans = List<int>.filled(2 * nums.length, 0);
+  for (int i = 0; i < nums.length; i++) {
+    ans[i] = nums[i];
+    ans[i + nums.length] = nums[i];
+  }
+  return ans;
+}
+}