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Solution.cs

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public class Solution

{

public int NumberOfAlternatingGroups(int[] colors, int k)

{

int n = colors.Length;

int[] newColors = new int[n + k];

for (int i = 0; i < n + k; i++)

{

newColors[i] = colors[i % n];

}

int count = 0;

int left = 0, right = 0;

while (right < n + k)

{

if (right - left < k - 1)

{

int prev = right;

right++;

if (right == n + k - 1) break;

if (newColors[right] == newColors[prev]) left = prev + 1;

continue;

}

if (right - left == k - 1) count++;

left++;

}

return count;

}

}