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”].

Solution:

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