Java for LeetCode 228 Summary Ranges

Given a sorted integer array without duplicates, return the summary of its ranges.

For example, given [0,1,2,4,5,7], return ["0->2","4->5","7"].

解题思路：

JAVA实现如下：

public List<String> summaryRanges(int[] nums) {
        List<String> list = new ArrayList<String>();
		if (nums.length == 0)
			return list;
		int left = nums[0], index = nums[0];
		for (int i = 1; i < nums.length; i++) {
			if (index == nums[i] - 1)
				index++;
			else if (index == left) {
				list.add(index + "");
				left = nums[i];
				index = nums[i];
			} else {
				list.add(left + "->" + index);
				left = nums[i];
				index = nums[i];
			}

		}
		if (index == left)
				list.add(index + "");
		else
				list.add(left + "->" + index);

		return list;
    }