結果

問題 No.529 帰省ラッシュ
ユーザー beet
提出日時 2017-11-07 14:02:37
言語 C++11（廃止可能性あり）
(gcc 13.3.0)
結果
AC  
実行時間 391 ms / 4,500 ms
コード長 6,388 bytes
コンパイル時間 2,628 ms
コンパイル使用メモリ 195,124 KB
実行使用メモリ 58,996 KB
最終ジャッジ日時 2024-12-17 20:08:21
合計ジャッジ時間 8,051 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge3
このコードへのチャレンジ
（要ログイン）
ファイルパターン 結果
sample AC * 2
other AC * 18
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:273:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  273 |   scanf("%d %d %d",&n,&e,&q);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~
main.cpp:294:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  294 |     scanf("%d",&d);
      |     ~~~~~^~~~~~~~~
main.cpp:297:12: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  297 |       scanf("%d %d",&u,&w);
      |       ~~~~~^~~~~~~~~~~~~~~
main.cpp:308:12: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  308 |       scanf("%d %d",&s,&t);
      |       ~~~~~^~~~~~~~~~~~~~~
main.cpp: In member function ‘void BiconectedGraph::input(int, int)’:
main.cpp:159:12: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  159 |       scanf("%d %d",&a,&b);
      |       ~~~~~^~~~~~~~~~~~~~~

ソースコード

diff #
プレゼンテーションモードにする

#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//BEGIN CUT HERE
struct HLDecomposition {
  int n,pos;
  vector<vector<int> > G;
  vector<int> vid, head, sub, hvy, par, dep, inv, type;
  
  HLDecomposition(){}
  HLDecomposition(int sz):
    n(sz),pos(0),G(n),
    vid(n,-1),head(n),sub(n,1),hvy(n,-1),
    par(n),dep(n),inv(n),type(n){}
  
  void add_edge(int u, int v) {
    G[u].push_back(v);
    G[v].push_back(u);
  }
  void build(vector<int> rs=vector<int>(1,0)) {
    int c=0;
    for(int r:rs){
      dfs(r);
      bfs(r, c++);
    }
  }
  
  void dfs(int rt) {
    using T = pair<int,int>;
    stack<T> st;
    dep[rt]=0;
    st.emplace(rt,0);
    while(!st.empty()){
      int v=st.top().first;
      int &i=st.top().second;
      if(i<(int)G[v].size()){
    int u=G[v][i++];
    if(u==par[v]) continue;
    par[u]=v;
    dep[u]=dep[v]+1;
    st.emplace(u,0);
      }else{
    st.pop();
    int res=0;
    for(int u:G[v]){
      if(u==par[v]) continue;
      sub[v]+=sub[u];
      if(res<sub[u]) res=sub[u],hvy[v]=u;
    }
      }
    }
  }
  void bfs(int r,int c) {
    int &k=pos;
    queue<int> q({r});
    while(!q.empty()){
      int h=q.front();q.pop();
      for(int i=h;i!=-1;i=hvy[i]) {
    type[i]=c;
    vid[i]=k++;
    inv[vid[i]]=i;
    head[i]=h;
    for(int j:G[i])
      if(j!=par[i]&&j!=hvy[i]) q.push(j);
      }
    }
  }
  
  // for_each(vertex)
  // [l,r] <- attention!!
  void for_each(int u, int v, const function<void(int, int)>& f) {
    while(1){
      if (vid[u] > vid[v]) swap(u, v);
      f(max(vid[head[v]], vid[u]), vid[v]);
      if (head[u] != head[v]) v=par[head[v]];
      else break;
    }
  }
  
  // for_each(edge)
  // [l,r] <- attention!!
  void for_each_edge(int u, int v, const function<void(int, int)>& f) {
    while(1){
      if(vid[u] > vid[v]) swap(u,v);
      if(head[u] != head[v]){
    f(vid[head[v]],vid[v]);
        v=par[head[v]];
      } else{
    if(u!=v) f(vid[u]+1,vid[v]);
    break;
      }
    }
  }
  int lca(int u,int v){
    while(1){
      if(vid[u]>vid[v]) swap(u,v);
      if(head[u]==head[v]) return u;
      v=par[head[v]];
    }
  }
  int distance(int u,int v){
    return dep[u]+dep[v]-2*dep[lca(u,v)];
  }
};
//END CUT HERE
/*
signed main(){
  int n;
  cin>>n;
  HLDecomposition lca(n);
  for(int i=0;i<n;i++){
    int k;
    cin>>k;
    for(int j=0;j<k;j++){
      int c;
      cin>>c;
      lca.add_edge(i,c);
    }
  }
  lca.build();
  int q;
  cin>>q;
  while(q--){
    int u,v;
    cin>>u>>v;
    cout<<lca.lca(u,v)<<endl;
  }
  return 0;
}
/*
  verified on 2017/11/07
  http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=GRL_5_C&lang=jp
*/
struct BiconectedGraph{
  typedef pair<int,int> P;
  int n;
  vector<vector<int> > G,C,T;
  vector<int> ord,low,belong;
  vector<P> B;
  BiconectedGraph(){}
  BiconectedGraph(int sz):n(sz),G(sz),C(sz),T(sz){}
  
   void add_edge(int u,int v){
    G[u].push_back(v);
    G[v].push_back(u);
  }
   void input(int m,int offset){
    int a,b;
    for(int i=0;i<m;i++){
      scanf("%d %d",&a,&b);
      add_edge(a+offset,b+offset);
    }
  }
  
   bool is_bridge(int u,int v){
    if(ord[u]>ord[v]) swap(u,v);
    return ord[u]<low[v];
  }
  
  void dfs(int u,int p,int &k){
    ord[u]=low[u]=k;
    ++k;
    for(int v:G[u]){
      if(v==p) continue;
      if(ord[v]>=0){
    low[u]=min(low[u],ord[v]);
      }else{
    dfs(v,u,k);
    low[u]=min(low[u],low[v]);
      }
      if(is_bridge(u,v)) B.push_back(P(u,v));
    }
  }
  
  void fill_component(int c,int u){
    C[c].push_back(u);
    belong[u]=c;
    for(int v:G[u]){
      if(belong[v]>=0||is_bridge(u,v)) continue;
      fill_component(c,v);
    }
  }
  
  void add_component(int u,int &k){
    if(belong[u]>=0) return;
    fill_component(k++,u);
  }
  
  int build(){
    int k=0;
    ord.resize(n);
    low.resize(n);
    belong.resize(n);
    fill(ord.begin(),ord.end(),-1);
    fill(belong.begin(),belong.end(),-1);
    for(int u=0;u<n;u++){
      if(ord[u]>=0) continue;
      dfs(u,-1,k);
    }
    k=0;
    for(int i=0;i<(int)B.size();i++){
      add_component(B[i].first,k);
      add_component(B[i].second,k);
    }
    for(int u=0;u<n;u++) add_component(u,k);
    for(int i=0;i<(int)B.size();i++){
      int u=belong[B[i].first],v=belong[B[i].second];
      T[u].push_back(v);
      T[v].push_back(u);
    }
    return k;
  }
};
template <typename T,typename E>
struct SegmentTree{
  typedef function<T(T,T)> F;
  typedef function<T(T,E)> G;
  int n;
  F f;
  G g;
  T d1;
  E d0;
  vector<T> dat;
  SegmentTree(){};
  SegmentTree(int n_,F f,G g,T d1,
          vector<T> v=vector<T>()):
    f(f),g(g),d1(d1){
    init(n_);
    if(n_==(int)v.size()) build(n_,v);
  }
  void init(int n_){
    n=1;
    while(n<n_) n*=2;
    dat.clear();
    dat.resize(2*n-1,d1);
  }
  void build(int n_, vector<T> v){
    for(int i=0;i<n_;i++) dat[i+n-1]=v[i];
    for(int i=n-2;i>=0;i--)
      dat[i]=f(dat[i*2+1],dat[i*2+2]);
  }
  void update(int k,E a){
    k+=n-1;
    dat[k]=g(dat[k],a);
    while(k>0){
      k=(k-1)/2;
      dat[k]=f(dat[k*2+1],dat[k*2+2]);
    }
  }
  inline T query(int a,int b){
    T vl=d1,vr=d1;
    for(int l=a+n,r=b+n;l<r;l>>=1,r>>=1) {
      if(l&1) vl=f(vl,dat[(l++)-1]);
      if(r&1) vr=f(dat[(--r)-1],vr);
    }
    return f(vl,vr);
  }
  
};
signed main(){
  int n,e,q;
  scanf("%d %d %d",&n,&e,&q);
  
  BiconectedGraph big(n);
  big.input(e,-1);
  int E=0,V=big.build();
  HLDecomposition hl(V);
  for(int i=0;i<V;i++)
    for(int j:big.T[i])
      if(i<j) hl.add_edge(i,j),E++;
  
  hl.build();
  SegmentTree<int,int> rmq(V,
               [](int a,int b){return max(a,b);},
               [](int a,int b){return b;},
               -1);
  vector<priority_queue<int> > pq(V);
  map<int,int> m;
  int num=0;
  for(int i=0;i<q;i++){
    int d;
    scanf("%d",&d);
    if(d==1){
      int u,w;
      scanf("%d %d",&u,&w);
      u--;
      u=big.belong[u];
      u=hl.vid[u];
      m[w]=u;
      if(pq[u].empty()||pq[u].top()<w) rmq.update(u,w);
      pq[u].push(w);
      num++;
    }
    if(d==2){
      int s,t;
      scanf("%d %d",&s,&t);
      s--;t--;
      s=big.belong[s];
      t=big.belong[t];
      int ans=-1;
      hl.for_each(s, t, [&](int l, int r) {
      ans = max(ans,rmq.query(l, r + 1));
    });
      printf("%d\n",ans);
      if(~ans){
    int k=m[ans];
    pq[k].pop();
    rmq.update(k,(!pq[k].empty()?pq[k].top():-1));       
    num--;
      }
    }
  }
  return 0;
}
/* verified on 2017/11/07
https://yukicoder.me/problems/no/529
*/
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
0