1
2import java.util.ArrayList;
3import java.util.List;
4
5public class Solution {
6    public List<String> summaryRanges(int[] nums) {
7        List<String> result = new ArrayList<>();
8        int i = 0;
9        while (i < nums.length) {
10            int start = i;
11            while (i + 1 < nums.length && nums[i] + 1 == nums[i + 1]) { 
12                i++;
13            }
14            if (start == i) {
15                result.add(String.valueOf(nums[start]));
16            } else {
17                result.add(nums[start] + "->" + nums[i]);
18            }
19            i++;
20        }
21        return result;
22    }
23}
24

1
#include <vector>
#include <string>

using namespace std;

vector<string> summaryRanges(vector<int>& nums) {
    vector<string> result;
    int n = nums.size();
    int i = 0;
    while (i < n) {
        int start = i;
        int j = i;
        while (j + 1 < n && nums[j] + 1 == nums[j + 1]) {
            j++;
        }
        if (start == j) {
            result.push_back(to_string(nums[start]));
        } else {
            result.push_back(to_string(nums[start]) + "->" + to_string(nums[j]));
        }
        i = j + 1;
    }
    return result;
}