func leastBricks(wall [][]int) int {
	cnt := 0
	freq := make(map[int]int)
	for i := range wall {
		left := 0
		for _, w := range wall[i] {
			if left != 0 {
				freq[left]++
				cnt = maxInt(cnt, freq[left])
			}
			left += w
		}
	}
	return len(wall) - cnt
}

func maxInt(x, y int) int {
	if x < y {
		return y
	}
	return x
}