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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main(){
  5.     int t;
  6.     scanf("%d",&t);
  7.     vector<string> g[t+3];
  8.     for(int i=0;i<t;++i){
  9.         for(int j=0;j<3;++j){
  10.             string s;
  11.             cin>>s;
  12.             g[i].push_back(s);
  13.         }
  14.     }
  15.  
  16.     int res = 0;
  17.  
  18.     for(int i=1;i<=1<<t;++i){
  19.         int temp=0;
  20.         unordered_set<string> st;
  21.         for(int j=0;j<t;++j){
  22.             if(i&(1<<j)){
  23.                 if(st.find(g[j][0])!=st.end()){
  24.                     break;
  25.                 } else {
  26.                     st.insert(g[j][0]);
  27.                 }
  28.                 if(st.find(g[j][1])!=st.end()){
  29.                     break;
  30.                 } else {
  31.                     st.insert(g[j][1]);
  32.                 }
  33.                 if(st.find(g[j][2])!=st.end()){
  34.                     break;
  35.                 } else {
  36.                     st.insert(g[j][2]);
  37.                 }
  38.                 ++temp;
  39.                 res=max(res,temp);
  40.             }
  41.         }
  42.     }
  43.  
  44.     printf("%d\n",res);
  45. }
Success #stdin #stdout 0s 16064KB
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stdin
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7
gerostratos scorpio shamgshamg
zaitsev silverberg cousteau
zaitsev petersen shamgshamg
clipper petersen shamgshamg
clipper bakirelli vasiliadi
silverberg atn dolly
knuth dijkstra bellman
stdout
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4
https://ideone.com/hbuOAp
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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