結果
問題 |
No.3189 Semifinal Stage
|
ユーザー |
|
提出日時 | 2025-09-10 15:09:49 |
言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
結果 |
RE
|
実行時間 | - |
コード長 | 4,021 bytes |
コンパイル時間 | 4,545 ms |
コンパイル使用メモリ | 295,616 KB |
実行使用メモリ | 9,344 KB |
最終ジャッジ日時 | 2025-09-10 15:10:00 |
合計ジャッジ時間 | 10,932 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge |
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ファイルパターン | 結果 |
---|---|
sample | RE * 1 TLE * 1 |
other | -- * 30 |
ソースコード
#include <bits/stdc++.h> using namespace std; #define rep(i,n) for (int i = 0; i< (n); ++i) #define repi(i, a, b) for (int i = (a); i < (b); ++i) #define all(x) (x).begin(), (x).end() #define fore(i, a) for(auto &i:a) using ll = long long; #include<atcoder/segtree> using namespace atcoder; void chmin(int &a, int b){if(b < a) a = b;} class HLdecomposition{ private: int V; vector<vector<int> > G; vector<int> stsize, parent, pathtop, pathbottom, in, out, dist; int root; void BuildStsize(int u, int p){ stsize[u] = 1, parent[u] = p; for(int& v : G[u]){ if(v == p){ if(v == G[u].back()) break; else swap(v, G[u].back()); } dist[v] = dist[u]+1; BuildStsize(v, u); stsize[u] += stsize[v]; if(stsize[v] > stsize[G[u][0]]){ swap(v, G[u][0]); } } } void BuildPath(int u, int p, int& tm){ in[u] = tm++; if(G[u].empty()){ pathbottom[pathtop[u]] = u; } for(int v : G[u]){ if(v == p) continue; pathtop[v] = (v == G[u][0] ? pathtop[u] : v); BuildPath(v, u, tm); } out[u] = tm; } public: int get_pathbottom(int u){return pathbottom[pathtop[u]];} int get_parent(int u){return parent[u];} int get_pathtop(int u){return pathtop[u];} int get_dist(int u){return dist[u];} void add_edge(int u, int v){ G[u].push_back(v), G[v].push_back(u); } void build(int _root=0){ root = _root; int tm = 0; BuildStsize(root, -1); pathtop[root] = root; BuildPath(root, -1, tm); } //元の頂点のインデックスの配列上でのidを返す inline int get(int a){ return in[a]; } int lca(int a, int b){ int pa = pathtop[a], pb = pathtop[b]; while(pathtop[a] != pathtop[b]){ if(in[pa] > in[pb]){ a = parent[pa], pa = pathtop[a]; }else{ b = parent[pb], pb = pathtop[b]; } } if(in[a] > in[b]) swap(a, b); return a; } void subtree_query(int a, const function< void(int, int) > &func){ func(in[a], out[a]); } // 例: hl.path_query(q, r, [&](int l, int r){ seg.range(l, r, s); }) // 例: hl.query(q, r, [&](int l, int r){ ans += seg.query(l, r); }) void path_query(int a, int b, const function< void(int, int) > &func){ int pa = pathtop[a], pb = pathtop[b]; while(pathtop[a] != pathtop[b]){ if(in[pa] > in[pb]){ func(in[pa], in[a] + 1); a = parent[pa], pa = pathtop[a]; }else{ func(in[pb], in[b] + 1); b = parent[pb], pb = pathtop[b]; } } if(in[a] > in[b]) swap(a, b); func(in[a], in[b] + 1); } HLdecomposition(int node_size) : V(node_size), G(V), stsize(V, 0), parent(V, -1), pathtop(V, -1), in(V, -1), out(V, -1), pathbottom(V, -1), dist(V, 0){} }; const int INF = 1073741823; int op(int a, int b){ return min(a, b); } int e(){ return INF; } int main() { int n; cin >> n; HLdecomposition hld(n); rep(i, n-1){ int u, v; cin >> u >> v; u--;v--; hld.add_edge(u, v); } hld.build(); int q;cin >> q; vector<pair<int,int>> qs(q); rep(i, q){int t, a;cin >> t >> a;qs[i] = {t, --a};} vector<set<pair<int,int>>> sets(n); rep(i, n)sets[i].insert({INF,-1}); segtree<int, op, e> seg1(n), seg2(n); rep(i, q){ auto[t, a] = qs[i]; a--; if(t == 1){ pair<int,int> p = {hld.get_dist(a), a}; int pos = a; while(pos != -1){ if(sets[pos].count(p))sets[pos].erase(p); else sets[pos].insert(p); auto[mind, _] = *sets[pos].begin(); seg1.set(hld.get(pos), mind); seg2.set(hld.get(pos), mind-2*hld.get_dist(pos)); pos = hld.get_parent(hld.get_pathtop(pos)); } } else{ int pos = a; int ans1 = INF; int ans2 = INF; while(pos != -1){ chmin(ans1, seg1.prod(hld.get(pos), hld.get(hld.get_pathbottom(pos))+1)+hld.get_dist(a)-2*hld.get_dist(pos)); chmin(ans2, seg2.prod(hld.get(hld.get_pathtop(pos)), hld.get(pos))+hld.get_dist(a)); } cout << min(ans1, ans2) << endl; } } }