【华为编程大赛】投票有关问题

【华为编程大赛】投票问题
输入若干候选人，以及投票，格式如下，输出（按输入候选人输入顺序）候选人以及得票，以及
无效票数。
Input：
addCandidate xx1
addCandidate xx2
addCandidate xx3
addCandidate xx4
addCandidate xx5
addCandidate xx6
vote xx2
vote xx2
vote xx3
vote xx3
vote xx4
vote xx6
vote xx7
vote xx1
vote xx1
Output：
xx1 2
xx2 2
xx3 2
xx4 1
xx6 1

1

用链表做的，查找不高效，因为要保持输入顺序。

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <string>
#include <cstring>
#include <algorithm>
#include <vector>
#include <sstream>
#include <set>
#include <map>
#include <cmath>

using namespace std;
typedef struct person{
	string name;
	int num;
	person *next;
	person(string name, int num)
	{
		this->name = name;
		this->num = num;
		this->next = NULL;
	}
}person;

void destroyList(person *head)
{
	//delete the person node's memory here.
	return;
}

int main()
{
	string lines;
	string word;
	string name;
	person *head = NULL;
	person *tail = NULL;
	while(getline(cin, lines))
	{
		istringstream iss(lines);
		iss>>word;
		iss>>name;
		if (word != "add")
		{
			break;
		}
		
		person * cur = new person(name,0);
		if (head == NULL)
		{
			head = cur;
			tail = cur;
		}
		else 
		{
			tail->next = cur;
			tail = cur;
		}
	}

	int illegal = 0;

	person *tmp = head;
	while(tmp != NULL)
	{
		if (tmp->name == name)
		{
			tmp->num++;
			break;
		}
		else tmp = tmp->next;
	}
	while(getline(cin, lines))
	{
		istringstream iss(lines);
		iss>>word;
		iss>>name;
		if (word == "vote")
		{
			tmp = head;
			while(tmp != NULL)
			{
				if (tmp->name == name)
				{
					tmp->num++;
					break;
				}
				else tmp = tmp->next;
			}
			if (tmp == NULL)
			{
				illegal++;
			}
		}
	}

	tmp = head;
	while(tmp != NULL)
	{
		if (tmp->num > 0)
		{
			cout<<tmp->name<<" "<<tmp->num<<endl;
		}
		tmp = tmp->next;
	}
	cout<<illegal<<endl;
	destroyList(head);

	system("pause");
	return 0;
}