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"].

Tips:

遍历一遍就好啦， O(n)

Code:

public class Solution {
    public List<String> summaryRanges(int[] nums) {
    ArrayList<String> list=new ArrayList();
    if(nums.length==1){
        list.add(nums[0]+"");
        return list;
    }
    for(int i=0;i<nums.length;i++){
        int a=nums[i];
        while(i+1<nums.length&&(nums[i+1]-nums[i])==1){
            i++;
        }
        if(a!=nums[i]){
            list.add(a+"->"+nums[i]);
        }else{
            list.add(a+"");
        }
    }
    return list;
    }
}