結果
問題 | No.1718 Random Squirrel |
ユーザー | carrot46 |
提出日時 | 2021-10-22 23:41:25 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 237 ms / 2,000 ms |
コード長 | 3,567 bytes |
コンパイル時間 | 2,860 ms |
コンパイル使用メモリ | 211,976 KB |
最終ジャッジ日時 | 2025-01-25 04:31:56 |
ジャッジサーバーID (参考情報) |
judge2 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 31 |
ソースコード
#include <bits/stdc++.h> #include <atcoder/modint> using namespace atcoder; //#pragma GCC optimize ("O3") using namespace std; #define reps(i,s,n) for(int i = s; i < n; i++) #define rep(i,n) reps(i,0,n) #define Rreps(i,n,e) for(int i = n - 1; i >= e; --i) #define Rrep(i,n) Rreps(i,n,0) #define ALL(a) a.begin(), a.end() using ll = long long; using vec = vector<ll>; using mat = vector<vec>; ll N,M,H,W,Q,K,A,B; string S; using P = pair<ll, ll>; using tp = tuple<ll, ll, ll>; const ll INF = (1LL<<60); template<class T> bool chmin(T &a, const T b){ if(a > b) {a = b; return true;} else return false; } template<class T> bool chmax(T &a, const T b){ if(a < b) {a = b; return true;} else return false; } template<class T> void my_printv(std::vector<T> v,bool endline = true){ if(!v.empty()){ for(std::size_t i{}; i<v.size()-1; ++i) std::cout<<v[i]<<" "; std::cout<<v.back(); } if(endline) std::cout<<std::endl; } using mint = modint998244353; using vm = vector<mint>; int main() { cin.tie(nullptr); ios::sync_with_stdio(false); cin>>N>>K; mat G(N); rep(i, N - 1){ int u, v; cin>>u>>v; --u; --v; G[u].push_back(v); G[v].push_back(u); } vec flag(N, 0); rep(i, K) { cin>>A; flag[A - 1] = 1; } int r = -1; { vec num_d(N); auto dfs1 = [&](auto &&self, int p, int v) -> void{ num_d[v] = flag[v]; for(int to : G[v]){ if(to != p){ self(self, v, to); num_d[v] += num_d[to]; } } if(r == -1){ if(num_d[v] > 0) flag[v] = 1; if(num_d[v] == K) r = v; } }; dfs1(dfs1, -1, 0); } ll base = accumulate(ALL(flag), -1) * 2; vec dist(N, INF), parent(N, -1); { rep(i, N) if(flag[i]) { dist[i] = 0; parent[i] = i; } queue<P> que; rep(i, N){ if(flag[i]){ for(int to : G[i]){ if(chmin(dist[to], 1LL)){ que.emplace(to, i); } } } } while(!que.empty()){ auto [v, p] = que.front(); que.pop(); parent[v] = p; for(int to : G[v]){ if(chmin(dist[to], dist[v] + 1)){ que.emplace(to, p); } } } } vec res(N, 0); { auto calc_dist = [&](int st) { vec dist_in_r(N, INF); dist_in_r[st] = 0; queue<int> que; que.push(st); while (!que.empty()) { int v = que.front(); que.pop(); for (int to : G[v]) { if (flag[to] && chmin(dist_in_r[to], dist_in_r[v] + 1)) { que.push(to); } } } rep(i, N) if(!flag[i]) dist_in_r[i] = -1; return dist_in_r; }; auto d1 = calc_dist(r); int tp = max_element(ALL(d1)) - begin(d1); auto dL = calc_dist(tp); int bt = max_element(ALL(dL)) - begin(dL); auto dR = calc_dist(bt); rep(i, N) if(flag[i]) res[i] = - max(dL[i], dR[i]); rep(i, N) if(!flag[i]) res[i] = dist[i] + res[parent[i]]; } rep(i, N) { //cout<<flag[i]<<' '<<res[i]<<' '<<base<<endl; cout<<res[i] + base<<endl; } }