test/yukicoder/4918.test.cpp

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Last update: 2020-10-27 12:29:50+09:00
Problem: https://yukicoder.me/problems/4918

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Code

// verification-helper: PROBLEM https://yukicoder.me/problems/4918

#include<bits/stdc++.h>
using namespace std;

#define call_from_test
#include "../../io/tuple.cpp"
#include "../../tools/chminmax.cpp"
#undef call_from_test

signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  int n,m;
  cin>>n>>m;
  auto [as, bs]=read_tuple<int, int>(m);

  vector G(n,vector(n,n));

  for(int i=0;i<n;i++) G[i][i]=0;

  for(int i=0;i<m;i++){
    as[i]--;bs[i]--;
    G[as[i]][bs[i]]=1;
    G[bs[i]][as[i]]=1;
  }

  for(int k=0;k<n;k++)
    for(int i=0;i<n;i++)
      for(int j=0;j<n;j++)
        chmin(G[i][j],G[i][k]+G[k][j]);

  int ans=0;
  for(int i=0;i<n;i++)
    for(int j=0;j<i;j++)
      for(int k=0;k<j;k++)
        if(G[i][j]!=2 and G[i][k]!=2 and G[j][k]!=2) ans++;

  cout<<ans<<endl;
  return 0;
}

#line 1 "test/yukicoder/4918.test.cpp"
// verification-helper: PROBLEM https://yukicoder.me/problems/4918

#include<bits/stdc++.h>
using namespace std;

#define call_from_test
#line 1 "io/tuple.cpp"

#line 3 "io/tuple.cpp"
using namespace std;
#endif

//BEGIN CUT HERE
template<typename TV, const int N> void read_tuple_impl(TV&) {}
template<typename TV, const int N, typename Head, typename... Tail>
void read_tuple_impl(TV& ts) {
  get<N>(ts).emplace_back(*(istream_iterator<Head>(cin)));
  read_tuple_impl<TV, N+1, Tail...>(ts);
}
template<typename... Ts> decltype(auto) read_tuple(size_t n) {
  tuple<vector<Ts>...> ts;
  for(size_t i=0;i<n;i++) read_tuple_impl<decltype(ts), 0, Ts...>(ts);
  return ts;
}
//END CUT HERE

#ifndef call_from_test
signed main(){
  return 0;
}
#endif
#line 1 "tools/chminmax.cpp"

#line 3 "tools/chminmax.cpp"
using namespace std;
#endif
//BEGIN CUT HERE
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
//END CUT HERE
#ifndef call_from_test
signed main(){
  return 0;
}
#endif
#line 9 "test/yukicoder/4918.test.cpp"
#undef call_from_test

signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  int n,m;
  cin>>n>>m;
  auto [as, bs]=read_tuple<int, int>(m);

  vector G(n,vector(n,n));

  for(int i=0;i<n;i++) G[i][i]=0;

  for(int i=0;i<m;i++){
    as[i]--;bs[i]--;
    G[as[i]][bs[i]]=1;
    G[bs[i]][as[i]]=1;
  }

  for(int k=0;k<n;k++)
    for(int i=0;i<n;i++)
      for(int j=0;j<n;j++)
        chmin(G[i][j],G[i][k]+G[k][j]);

  int ans=0;
  for(int i=0;i<n;i++)
    for(int j=0;j<i;j++)
      for(int k=0;k<j;k++)
        if(G[i][j]!=2 and G[i][k]!=2 and G[j][k]!=2) ans++;

  cout<<ans<<endl;
  return 0;
}