結果
問題 | No.529 帰省ラッシュ |
ユーザー | beet |
提出日時 | 2017-11-07 14:13:14 |
言語 | C++11 (gcc 11.4.0) |
結果 |
AC
|
実行時間 | 455 ms / 4,500 ms |
コード長 | 6,391 bytes |
コンパイル時間 | 2,512 ms |
コンパイル使用メモリ | 194,556 KB |
実行使用メモリ | 59,112 KB |
最終ジャッジ日時 | 2024-05-10 01:01:50 |
合計ジャッジ時間 | 8,442 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 1 ms
5,248 KB |
testcase_01 | AC | 2 ms
5,376 KB |
testcase_02 | AC | 2 ms
5,376 KB |
testcase_03 | AC | 2 ms
5,376 KB |
testcase_04 | AC | 5 ms
5,376 KB |
testcase_05 | AC | 5 ms
5,376 KB |
testcase_06 | AC | 5 ms
5,376 KB |
testcase_07 | AC | 5 ms
5,376 KB |
testcase_08 | AC | 332 ms
28,960 KB |
testcase_09 | AC | 331 ms
29,880 KB |
testcase_10 | AC | 358 ms
37,264 KB |
testcase_11 | AC | 353 ms
37,436 KB |
testcase_12 | AC | 265 ms
31,172 KB |
testcase_13 | AC | 419 ms
59,112 KB |
testcase_14 | AC | 313 ms
33,504 KB |
testcase_15 | AC | 455 ms
41,144 KB |
testcase_16 | AC | 446 ms
41,156 KB |
testcase_17 | AC | 393 ms
51,544 KB |
testcase_18 | AC | 396 ms
51,804 KB |
testcase_19 | AC | 386 ms
48,916 KB |
コンパイルメッセージ
main.cpp: In function ‘int main()’: main.cpp:274:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 274 | scanf("%d %d %d",&n,&e,&q); | ~~~~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:295:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 295 | scanf("%d",&d); | ~~~~~^~~~~~~~~ main.cpp:298:12: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 298 | scanf("%d %d",&u,&w); | ~~~~~^~~~~~~~~~~~~~~ main.cpp:309:12: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 309 | scanf("%d %d",&s,&t); | ~~~~~^~~~~~~~~~~~~~~ main.cpp: In member function ‘void BiconectedGraph::input(int, int)’: main.cpp:160:12: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 160 | scanf("%d %d",&a,&b); | ~~~~~^~~~~~~~~~~~~~~
ソースコード
#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; par[rt]=-1; 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 */