Leetcode 71. 简化路径

题目

Leetcode 71. 简化路径

代码（9.28 首刷调试看解析）

class Solution {
public:
    string simplifyPath(string path) {
        vector<string> parts;
        int start = 0;
        for(int i = 1; i <= path.size(); ++i) {
            if(path[i] == '/' || i == path.size()) {
                string part = path.substr(start+1, i-start-1);
                if(part == "" || part == ".") {

                } else if(part == "..") {
                    if(!parts.empty()) parts.pop_back();
                } else {
                    parts.push_back(part);
                }
                start = i;
            }
        }
        string res;
        for(string& s : parts) {
            res += "/" + s;
        }
        return res == "" ? "/" : res;
    }
};
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