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+// 2579. Count Total Number of Colored Cells
+#include "leetcode.h"
+
+/*
+ * there exists an infinitely large two-dimensional grid of uncoloured unit
+ * cells. you are given a positive integer 'n', indicating that you must do the
+ * following routine for 'n' minutes: at the first minute, colour any arbitrary
+ * unit cell blue, and every minute thereafter, colour blue every uncoloured
+ * cell that touches a blue cell.
+ */
+
+long long coloredCells(int n) { return 2L * n * (n - 1) + 1; }
+
+int main() {
+ printf("%lld\n", coloredCells(1)); // expect: 1
+ printf("%lld\n", coloredCells(2)); // expect: 5
+}