1
2#include <stdio.h>
3#include <stdlib.h>
4#include <string.h>
5
6char** summaryRanges(int* nums, int numsSize, int* returnSize) {
7    char **result = (char **)malloc(numsSize * sizeof(char *));
8    *returnSize = 0;
9    int i = 0;
10    while (i < numsSize) {
11        int start = i;
12        while (i + 1 < numsSize && nums[i] + 1 == nums[i + 1]) {
13            i++;
14        }
15        int end = i;
16        char *range = (char *)malloc(25 * sizeof(char));
17        if (start == end) {
18            sprintf(range, "%d", nums[start]);
19        } else {
20            sprintf(range, "%d->%d", nums[start], nums[end]);
21        }
22        result[(*returnSize)++] = range;
23        i++;
24    }
25    return result;
26}
27

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