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2579. Count Total Number of Colored Cells 👍

  • Time: $O(1)$
  • Space: $O(1)$
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class Solution {
 public:
  long long coloredCells(int n) {
    return static_cast<long>(n) * n + static_cast<long>(n - 1) * (n - 1);
  }
};

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class Solution {
  public long coloredCells(int n) {
    return 1L * n * n + 1L * (n - 1) * (n - 1);
  }
}

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class Solution:
  def coloredCells(self, n: int) -> int:
    return n**2 + (n - 1)**2