class Solution {

public:

string simplifyPath(string path) {

if(path.back() != '/')

path += '/';

int length = path.size();

vector<string> resVector;

string subResult;

string result = "";

bool flag = 0;

for(int i = 0; i < length; ++i)

{

if(path[i] == '/' && flag == false)

flag = true;

else if(path[i] == '/' && flag == true)

{

if(subResult == ".")

;

else if(subResult == "..")

{

if(resVector.size() > 0)

resVector.pop_back();

}

else if(subResult != "")

resVector.push_back(subResult);

subResult = "";

}

else

subResult += path[i];

}

for(auto row : resVector)

{

result += "/" + row;

}

if(result == "")

result = "/";

return result;

}

};