graph/arborescence_edmond.cpp

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• Last update: 2020-10-27 18:08:33+09:00

Depends on

• graph/stronglyconnectedcomponent.cpp

Verified with

• test/aoj/2309.tarjan.test.cpp
• test/aoj/2309.test.cpp
• test/aoj/2647.test.cpp
• test/aoj/GRL_2_B.test.cpp

Code

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

#define call_from_test
#include "stronglyconnectedcomponent.cpp"
#undef call_from_test

#endif
//BEGIN CUT HERE
template<typename T>
struct Arborescence{
  struct edge{
    int to;
    T cost;
    edge(int to,T cost):to(to),cost(cost){}
  };
  vector<vector<edge>> B;

  Arborescence(int n):B(n){}

  void add_edge(int u,int v,T cost){
    assert(u!=v);
    B[u].emplace_back(v,cost);
  }

  T build(int r){
    T res=0;
    auto G=B;
    const T INF = numeric_limits<T>::max()/2;
    while(1){
      int n=G.size();
      vector<T> ws(n,INF);
      vector<int> rs(n,-1);
      for(int v=0;v<n;v++){
        for(edge &e:G[v]){
          if(e.cost<ws[e.to]){
            ws[e.to]=e.cost;
            rs[e.to]=v;
          }
        }
      }
      SCC scc(n);
      for(int i=0;i<n;i++){
        if(i==r) continue;
        scc.add_edge(rs[i],i);
        res+=ws[i];
      }
      int m=scc.build();
      if(m==n) break;
      vector<vector<edge>> H(m);
      for(int v=0;v<n;v++){
        for(auto &e:G[v]){
          if(scc[v]==scc[e.to]) continue;
          H[scc[v]].emplace_back(scc[e.to],e.cost-ws[e.to]);
        }
      }
      r=scc[r];
      G=H;
    }
    return res;
  }
};
//END CUT HERE
#ifndef call_from_test
//INSERT ABOVE HERE
signed main(){
  return 0;
}
#endif

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.11.3/x64/lib/python3.11/site-packages/onlinejudge_verify/documentation/build.py", line 71, in _render_source_code_stat
    bundled_code = language.bundle(stat.path, basedir=basedir, options={'include_paths': [basedir]}).decode()
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.3/x64/lib/python3.11/site-packages/onlinejudge_verify/languages/cplusplus.py", line 187, in bundle
    bundler.update(path)
  File "/opt/hostedtoolcache/Python/3.11.3/x64/lib/python3.11/site-packages/onlinejudge_verify/languages/cplusplus_bundle.py", line 400, in update
    raise BundleErrorAt(path, i + 1, "unable to process #include in #if / #ifdef / #ifndef other than include guards")
onlinejudge_verify.languages.cplusplus_bundle.BundleErrorAt: graph/arborescence_edmond.cpp: line 6: unable to process #include in #if / #ifdef / #ifndef other than include guards

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