func stoneBlocks(h []int) int {
	height := make([]int, 0, len(h))
	blocks := 0

	for _, v := range h {
		for len(height) > 0 && height[len(height)-1] > v {
			height = height[:len(height)-1]
		}
		if len(height) > 0 && height[len(height)-1] == v {
			continue
		}

		height = append(height, v)
		blocks++
	}

	return blocks
}