LeetCode - Refresh - Simplify Path

 1 class Solution {
 2 public:
 3     vector<string> splits(string s) {
 4         vector<string> result;
 5         int len = s.size();
 6         for (int i = len-1; i >= 0; i--) {
 7             if (s[i] == ‘/‘) {
 8                 len = i;
 9             } else if (i == 0 || s[i-1] == ‘/‘) {
10                 result.push_back(s.substr(i, len-i));
11             }
12         }
13         return result;
14     }
15     string simplifyPath(string path) {
16         if (path.size() == 0) return "/";
17         vector<string> paths = splits(path.substr(1));
18         stack<string> s;
19         string result;
20         for (int i = paths.size()-1; i >= 0; i--) {
21             if (!s.empty() && paths[i] == "..") {
22                 s.pop();
23             } else if (paths[i] != "." && paths[i] != "..") {
24                 s.push(paths[i]);
25             }
26         }
27         if (s.empty()) return "/";
28         while (!s.empty()) {
29             result = ‘/‘ + s.top() + result;
30             s.pop();
31         }
32         return result;
33     }
34 };