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2729. Check if The Number is Fascinating 👍

  • Time: $O(1)$
  • Space: $O(1)$
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class Solution {
 public:
  bool isFascinating(int n) {
    string s = to_string(n) + to_string(2 * n) + to_string(3 * n);
    ranges::sort(s);
    return s == "123456789";
  }
};

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class Solution {
  public boolean isFascinating(int n) {
    String s = Integer.toString(n) + Integer.toString(2 * n) + Integer.toString(3 * n);
    char[] charArray = s.toCharArray();
    Arrays.sort(charArray);
    return new String(charArray).equals("123456789");
  }
}

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class Solution:
  def isFascinating(self, n):
    s = str(n) + str(2 * n) + str(3 * n)
    return ''.join(sorted(s)) == '123456789'