getline(ss, temp, '/')示例

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"

.

string simplifyPath(string path) {
string res, temp;
vector<string> stk;
stringstream ss(path);
while (getline(ss, temp, '/')) {
if (temp == "." || temp == "") continue;
else if (temp == ".."&&!stk.empty()) stk.pop_back();
else if(temp!="..") stk.push_back(temp);
}
for (auto str : stk) res += "/" + str;
return res.empty() ? "/" : res;
}