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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define pb push_back
  5. #define fi first
  6. #define se second
  7. #define mp make_pair
  8. #define all(cont) cont.begin(), cont.end()
  9.  
  10. int main()
  11. {
  12.     ios::sync_with_stdio(0);
  13.     cin.tie(0);
  14. #ifndef ONLINE_JUDGE
  15.     freopen("input.txt", "r", stdin);
  16.     freopen("output.txt", "w", stdout);
  17. #endif
  18.     ll tt = 1;
  19.     ll N;
  20.     string str;
  21.     while(getline(cin,str))
  22.     {
  23.         N = stoll(str);
  24.         ll M;
  25.         string val,a,b;
  26.         vector<string>arr(N);
  27.         unordered_map<string,bool>visited;
  28.         for(ll i=0;i<N;i++)
  29.         {
  30.  
  31.             cin>>val;
  32.             arr[i] = val;
  33.             visited[val] = false;
  34.         }
  35.         unordered_map<string,ll>indegree;
  36.         unordered_map<string,vector<string>>adj;
  37.         cin>>M;
  38.         for(ll i=0;i<M;i++)
  39.         {
  40.             cin>>a>>b;
  41.             adj[a].pb(b);
  42.             indegree[b]++;
  43.         }
  44.         string ans;
  45.         while(true)
  46.         {
  47.             bool flag = false;
  48.             for(int i=0;i<N;i++)
  49.             {
  50.                 if(indegree[arr[i]]==0 && !visited[arr[i]])
  51.                 {
  52.                     ans += arr[i]+" ";
  53.                     for(auto it:adj[arr[i]])
  54.                         indegree[it]--;
  55.                     flag = true;
  56.                     visited[arr[i]] = true;
  57.                 }
  58.             }
  59.             if(flag==false)
  60.                 break;
  61.         }
  62.         cout<<"Case #"<<tt<<": Vivek should drink beverages in this order: "<<ans<<endl;
  63.         cout<<endl;
  64.         tt++;
  65.         getline(cin,str);
  66.         getline(cin,str);
  67.     }
  68.  
  69.     return 0;
  70.  
  71.  
  72. }
  73.  
Success #stdin #stdout 0s 4296KB
comments (?)
stdin 
8
a
b
c
d
e
f
s
t
6
a e
a b
c d
e f
s t
a t

8
s
a
b
e
f
c
d
t
6
a e
a b
c d
e f
s t
a t

5
A
B
C
D
E
5
C A
D A
B D
E B
E C
stdout 
Case #1: Vivek should drink beverages in this order: a b c d e f s t 

Case #2: Vivek should drink beverages in this order: s a b e f c d t 

Case #3: Vivek should drink beverages in this order: E B C D A
https://ideone.com/do6RBr
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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