蓝桥杯-错误的票据

#include <iostream>
#include <string>
#include <sstream>
#include <cstring>

using namespace std;

const int Max = 100010;
int a[Max];

int main()
{
    int n;
    int mini = 9999999;
    int maxi = 0; 
    cin >> n;
    cin.get();           //输入带空格的字符串之前要注意吸收多余换行符 
    string s;
    memset(a,0,sizeof(a));
    while(n--)
    {
              getline(cin,s);
              stringstream ss(s);
              int x;
              while(ss>>x)
               {
                            if(x < mini)
                               mini = x;
                            if(x > maxi)
                               maxi = x;
                            a[x] ++;
               } 
      }
      for(int i = mini; i <= maxi; i++)
         if(a[i] == 0)
             cout << i << ' ';
         else
         if(a[i] == 2)
              cout << i  << endl;
              system("pause");
      return 0; 
}