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- #include <bits/stdc++.h>
- typedef long long ll;
- #define pb push_back
- #define ff first
- #define ss second
- const int N=2e3+7;
- const int mod=1e9+7;
- int32_t main()
- {
- ios_base::sync_with_stdio(false);
- cin.tie(0);
- int t;
- cin >> t;
- while(t--)
- {
- int n;
- cin >> n;
- char trump;
- cin >> trump;
- vector<string> cards,trumpCards;
- for(int i=0;i<2*n;i++)
- {
- string card;
- cin >> card;
- if(card[1]==trump)
- trumpCards.pb(card);
- else
- cards.pb(card);
- }
- vector< pair<string,string> > moves;
- for(int i=0;i<cards.size();i++)
- {
- for(int j=0;j<cards.size();j++)
- {
- if(i==j)
- continue;
- if(cards[i]=="")
- continue;
- if(cards[j]=="")
- continue;
- if(cards[i][1]==cards[j][1])
- {
- moves.pb({min(cards[i],cards[j]),max(cards[i],cards[j])});
- cards[i]="";
- cards[j]="";
- }
- }
- }
- bool ok=true;
- for(int i=0;i<cards.size();i++)
- {
- if(cards[i]!="")
- {
- if(trumpCards.empty())
- ok=false;
- else
- {
- moves.pb({cards[i],trumpCards.back()});
- trumpCards.pop_back();
- }
- }
- }
- if(trumpCards.size()%2==1)
- ok=false;
- if(!ok)
- {
- cout << "IMPOSSIBLE\n\n";
- continue;
- }
- sort(trumpCards.begin(),trumpCards.end());
- for(int i=0;i<trumpCards.size();i++)
- {
- moves.pb({trumpCards[i],trumpCards.back()});
- trumpCards.pop_back();
- }
- for(auto ele : moves)
- cout << ele.first << " " << ele.second << "\n";
- cout << "\n";
- }
- }
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