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// @Title: 汇总区间 (Summary Ranges)
// @Author: 15816537946@163.com
// @Date: 2021-01-10 20:56:37
// @Runtime: 0 ms
// @Memory: 1.9 MB
func summaryRanges(nums []int) []string {
	n := len(nums)
	if n == 0 {
		return nil
	}
	if n == 1 {
		return []string{fmt.Sprintf("%d", nums[0])}
	}
	var ret []string
	min := math.MinInt32
	for i := 0; i < n; i++ {
		a, b := nums[i], min
		for i < n-1 && nums[i]+1 == nums[i+1] {
			i++
			b = nums[i]
		}
		if b != min {
			ret = append(ret, fmt.Sprintf("%d->%d", a, b))
		} else {
			ret = append(ret, fmt.Sprintf("%d", a))
		}

	}

	return ret

}