71. Simplify Path(M)

71. Simplify Path

 Given an absolute path for a file (Unix-style), simplify it.

 For example,
 path = "/home/", => "/home"
 path = "/a/./b/../../c/", => "/c"
 click to show corner cases.

 Corner Cases:
 Did you consider the case where path = "/../"?
 In this case, you should return "/".
 Another corner case is the path might contain multiple slashes '/' together, such as "/home//foo/".
 In this case, you should ignore redundant slashes and return "/home/foo".

 class Solution {
 public:
      string simplifyPath(string path) {
         deque<string> qs;
         string result;
         int plen = path.size();
         string::size_type curindex = , lastindex = ;

         while (lastindex < plen && (curindex = path.find("/", lastindex)) != string::npos)
         {
             if(path.find("//", lastindex))
             {
                 qs.push_back(path.substr(lastindex, curindex+-lastindex));
                 lastindex = curindex+;
             }else if (path.find("./", lastindex)) {
                 lastindex = curindex+;
             }else if (path.find(".//", lastindex)) {
                 lastindex = curindex+;
             }else if (path.find("../", lastindex)) {
                 qs.pop_back(); // go back one step
                 lastindex = curindex+;
             }else if (path.find("..//", lastindex)) {
                 qs.pop_back();
                 lastindex = curindex+;
             }else {
                 qs.push_back(path.substr(lastindex, curindex+-lastindex));
                 lastindex = curindex+;
             }
         }

         while (!qs.empty()) {
             string tmp = qs.front();
             qs.pop_front();
             result.append(tmp);
         }
         if(result.size() != ){
             result.resize(result.size()-);
         }
         return result;
     }
 };