func findMinDifference(timePoints []string) int {
	n := len(timePoints)
	mins := make([]int, n)
	for i := range mins {
		mins[i] = time2int(timePoints[i])
	}
	sort.Ints(mins)
	const day int = 24 * 60
	diff := day
	for i := 0; i < n-1; i++ {
		diff = minInt(diff, mins[i+1]-mins[i])
	}
	diff = minInt(diff, mins[0]+day-mins[n-1])
	return diff
}

func time2int(t string) int {
	h := int(t[0]*10+t[1]) - 528
	m := int(t[3]*10+t[4]) - 528
	return h*60 + m
}

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