学步园

//用一个映射器就很容易解决问题了！ 
#include "iostream"
#include "string"
#include "map"
using namespace std;

map<string, string> m;

int main()
{
    string input, first, second;
    int pos, i, len;
    while (getline(cin, input))//将一个字符串分隔为两个字符串，分别装入map容器中 
    {
          first.clear();
          second.clear();
          pos = 0;
          if (input.length() == 0) break;
          len = input.length();
          for (i = 0; i < len; i++)
          {
              if (input[i] != ' ')
                 pos++;
              else break;
          }
          for (i = 0; i < pos; i++)
              first.push_back(input[i]);
          for (i = pos+1; i < len; i++)
              second.push_back(input[i]);
          m[second] = first;
    }
    
    string str;
    while (cin >> str)
    {
          if (m[str].length() != 0)//判断是否有元素与之对应 
             cout << m[str] << endl;
          else
             cout << "eh" << endl;
    }
}