fork download
copy 
  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define MO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  4. #define ll long long
  5. int q;
  6. string old , nw;
  7. map<string,string>mp;
  8. int main()
  9. {
  10.     MO
  11.     cin>>q;
  12.    while(q--)
  13.    {
  14.        cin>>old>>nw;
  15.        auto it = mp.find(old);
  16.        if(it!=mp.end())
  17.        {
  18.           old = it->second;
  19.            mp.erase(it);
  20.        }
  21.        mp[nw]=old;
  22.    }
  23.     cout<<mp.size()<<'\n';
  24.    for(auto it : mp)
  25.        cout<<it.second<<' '<<it.first<<'\n';
  26.     return 0;
  27. }
  28.  
Success #stdin #stdout 0.01s 5520KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
0
https://ideone.com/5YuAZi
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!