2014年去哪网算法笔试题

#include <iostream>
#include <string>
#include <string.h>
#include <list>
using namespace std;

bool Convert(string &strTarget, char str[], string &strMsg) 
{
	list<string> ls;
	list<string> ::iterator pos;
	const char *tag = "/";
	char *p;
	p = strtok(str, tag);
	while(p)
	{
		 if(0 == strcmp(p, "..")) 
		 {
			 if(0 == ls.size()) 
			 {
				 strMsg = "已经达到回退的上限";
				 return false;
			 }
			 else
			 	ls.pop_back();
		 }
		 else
			 ls.push_back(p);
		 p = strtok(NULL, tag);
	}

	for(pos = ls.begin(); pos != ls.end(); ++pos)
		strTarget = strTarget + "/" + *pos;
	return true;
}

int main()
{
	//char str[] = "/home/good/name/../../";
	//char str[] = "/home/good/name/../../../../";
	char str[] = "/home/../name/";
	string strTarget, strMsg;
	if(false == Convert(strTarget, str, strMsg))
		cout<< strMsg;
	else
		cout<< strTarget;
}