AC Code

自己做出来的，代码写的很烂，但是也浅浅记录一下叭，下面有看答案思路写出来的双指针代码

class Solution {
public:vector<string> summaryRanges(vector<int>& nums) {vector<string> ans;int n = nums.size();if(n == 1) ans.emplace_back(to_string(nums[0]));int i = 1;int front = 0;while( i < n){if(nums[i - 1] + 1 != nums[i]){string temp = "";if(front == i - 1){temp = to_string(nums[front]);}else{temp = to_string(nums[front]) + "->" + to_string(nums[i-1]);}front = i;ans.emplace_back(temp);}if(i == n - 1){string temp = "";if(front == i){temp = to_string(nums[front]);}else{temp = to_string(nums[front]) + "->" + to_string(nums[i]);}ans.emplace_back(temp);}i++;}return ans;}
};

双指针

class Solution {
public:vector<string> summaryRanges(vector<int>& nums) {vector<string> ans;int n = nums.size();int i = 0;while( i < n){int left = i;i++;while(i < n && nums[i - 1] + 1 == nums[i]){i++;}int right = i - 1;string tmp = to_string(nums[left]);if(left < right) tmp += "->" + to_string(nums[right]);ans.emplace_back(tmp);}return ans;}
};