leetcode-Summary Ranges-228

 1 class Solution {
 2 public:
 3     vector<string> summaryRanges(vector<int>& nums) {
 4         vector<string> v;
 5         int len=nums.size();
 6         if(len==0) return v;
 7         int low=nums[0];
 8         if(len==1){
 9             char a[20];
10             sprintf(a,"%d",low);
11             string s=a;
12             v.push_back(s);
13             return v;
14         }
15         int high;
16         for(int i=1;i<len;i++){
17             if(nums[i]==nums[i-1]+1) continue;
18             high=nums[i-1];
19             char a[20];
20             sprintf(a,"%d",low);
21             string s=a;
22             if(low!=high){
23                 s+="->";
24                 char b[20];
25                 sprintf(b,"%d",high);
26                 s+=b;    
27             } 
28             v.push_back(s);
29             low=nums[i];
30         }
31         high=nums[len-1];
32         char a[20];
33         sprintf(a,"%d",low);
34         string s=a;
35         if(low!=high){
36             s+="->";
37             char b[20];
38             sprintf(b,"%d",high);
39             s+=b;    
40         } 
41         v.push_back(s);
42         return v;
43     }
44 };