Summary Ranges

Desicription

Given a sorted integer array without duplicates, return the summary of its ranges.

Example 1:

1
2
3
Input: [0,1,2,4,5,7]
Output: ["0->2","4->5","7"]
Explanation: 0,1,2 form a continuous range; 4,5 form a continuous range.

Example 2:

1
2
3
Input: [0,2,3,4,6,8,9]
Output: ["0","2->4","6","8->9"]
Explanation: 2,3,4 form a continuous range; 8,9 form a continuous range.

Solution

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
class Solution {
public:
vector<string> summaryRanges(vector<int>& nums) {
vector<string> result;
int number1 = 1;
int number2 = 0;
for(auto& number : nums) {
if(number1 == number2 + 1) {
number1 = number;
number2 = number;
} else {
if(number == number2 + 1) {
number2++;
} else {
if(number1 == number2) {
result.push_back(to_string(number1));
} else {
result.push_back(to_string(number1) + "->" + to_string(number2));
}
number1 = number;
number2 = number;
}
}
}
if(number1 == number2) {
result.push_back(to_string(number1));
} else if(number1 != number2 + 1) {
result.push_back(to_string(number1) + "->" + to_string(number2));
}
return result;
}
};