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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 {
private:
int index;
string path;
string getpath()
{
index++;
string newpath="";
while(index<path.length() && path[index]!=‘/‘)
{
newpath=newpath+path[index];
index++;
}
return newpath;
}
public:
string simplifyPath(string path)
{
this->path=path;
stack<string> stk;
index=0;
while(index<path.size())
{
string newpath=getpath();
if(newpath=="..")
{
if(stk.empty()==false)
stk.pop();
continue;
}
if(newpath=="." || newpath=="") continue;
stk.push(newpath);
}
string result="";
while(stk.empty()==false)
{
result=‘/‘+stk.top()+result;
stk.pop();
}
if(result.length()==0) result="/";
return result;
}
};
private:
int index;
string path;
string getpath()
{
index++;
string newpath="";
while(index<path.length() && path[index]!=‘/‘)
{
newpath=newpath+path[index];
index++;
}
return newpath;
}
public:
string simplifyPath(string path)
{
this->path=path;
stack<string> stk;
index=0;
while(index<path.size())
{
string newpath=getpath();
if(newpath=="..")
{
if(stk.empty()==false)
stk.pop();
continue;
}
if(newpath=="." || newpath=="") continue;
stk.push(newpath);
}
string result="";
while(stk.empty()==false)
{
result=‘/‘+stk.top()+result;
stk.pop();
}
if(result.length()==0) result="/";
return result;
}
};
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