CCF201604-3 路径解析

题目：

我的代码（只AC了30分，请各位大神赐教）

#include <iostream>
#include <fstream>
#include <algorithm>
#include <string>
using namespace std;

int main()
{
	ifstream cin("test.txt");
	int p, i, j;

	while (cin >> p)
	{
		string InitStr, CurrentStr, temp;
		int InitLength, CurrentLength;
		cin >> InitStr;
		InitLength = InitStr.length();

		//这里的i不能在后边用来改变i的值，第一次就是这样调出的结果老是不符合预期 
		for (i = 0;i<p;i++)
		{
			cin >> CurrentStr;
			CurrentLength = CurrentStr.length();

			//对最后一位的'/'进行处理
			string::iterator it;
			it = CurrentStr.end();
			if (CurrentStr[CurrentLength - 1] == '/')
				CurrentStr.erase(it - 1, it);

			//对以".."开头进行处理
			if (CurrentStr[0] == '.' && CurrentStr[1] == '.')
			{
				it = CurrentStr.begin();
				CurrentStr.erase(it, it + 2);

				temp = InitStr;
				it = temp.end();

				temp.erase(it - 3, it);
				CurrentStr = temp + CurrentStr;
			}

			//对".."在中间时进行处理
			int flag1 = 0;
			for (j = 1;j <= 5;j++)
			{
				for (it = CurrentStr.begin();it != CurrentStr.end();it++)
				{
					if (*it == '/' && *(it + 1) == '.' && *(it + 2) == '.')
					{
						CurrentStr.erase(it - 3, it + 3);
					}
				}

				if (CurrentStr[0] == '/' && CurrentStr[1] == '.' && CurrentStr[2] == '.')
				{
					it = CurrentStr.begin();
					CurrentStr.erase(it, it + 3);
				}
			}

			//处理连续'/'
			string::iterator end_unique = unique(CurrentStr.begin(), CurrentStr.end()); // 移动重复到最后
			CurrentStr.erase(end_unique, CurrentStr.end()); //删除重复

															//处理'/.'
			for (it = CurrentStr.begin();it != CurrentStr.end();it++)
			{
				if (*it == '/' && *(it + 1) == '.')
				{
					CurrentStr.erase(it, it + 2);
				}
			}

			cout << CurrentStr << endl;
			//一定记得清空当前字符串，免得影响后面的操作
			CurrentStr.clear();
			temp.clear();
		}
	}
	return 0;
}

AC60分的代码：

#include <iostream>
#include <string>
#include <vector>
using namespace std;

int main()
{
	int num;
	string curDir;
	vector<string> list;

	cin >> num >> curDir;
	cin.ignore();
	for (int i = 0; i<num; i++)
	{
		string line;
		getline(cin, line);
		int pos;

		// 除去多个///
		while ((pos = line.find("//")) != -1)
		{
			int count = 2;
			while (line[pos + count] == '/')
			{
				count++;
			}
			line.erase(pos, count - 1);
		}

		// 除去../
		while ((pos = line.find("../")) != -1) 
		{
			if (line[0] == '/')
			{
				if (pos == 1)
				{
					line.erase(pos, 3);
				}
				else
				{
					int spos;
					spos = line.rfind("/", pos - 2);
					line.erase(spos, pos - spos + 2);
				}
			}
			else
			{
				line = curDir + "/" + line;
			}
		}

		// 除去./
		while ((pos = line.find("./")) != -1)
		{
			line.erase(pos, 2);
		}
		if (line.size()>1 && line[line.size() - 1] == '/')
			line.erase(line.size() - 1);
		list.push_back(line);
	}
	for (int j = 0; j<num; j++)
	{
		cout << list[j] << endl;
	}

	return 0;
}