Alternating Groups II
There is a circle of red and blue tiles.
There is a circle of red and blue tiles. You are given an array of integers colors and an integer k. The color of tile i is represented by colors[i]:
An alternating group is every k contiguous tiles in the circle with alternating colors (each tile in the group except the first and last one has a different color from its left and right tiles).
Return the number of alternating groups.
Note that since colors represents a circle, the first and the last tiles are considered to be next to each other.
Example 1
Input: colors = [0,1,0,1,0], k = 3
Output: 3
Explanation: Alternating groups:
Example 2
Input: colors = [0,1,0,0,1,0,1], k = 6
Output: 2
Explanation: Alternating groups:
Example 3
Input: colors = [1,1,0,1], k = 4
Output: 0
Constraints
- 3 <= colors.length <= 10^5
- 0 <= colors[i] <= 1
- 3 <= k <= colors.length
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