제출 #334006

#제출 시각아이디문제언어결과실행 시간메모리
334006limabeansEvacuation plan (IZhO18_plan)C++17
0 / 100
308 ms33620 KiB
#include <bits/stdc++.h> using namespace std; template<typename T> void out(T x) { cout << x << endl; exit(0); } #define watch(x) cout << (#x) << " is " << (x) << endl using ll = long long; const ll inf = 1e18; const int maxn = 1e5 + 5; int n, m, k; vector<pair<ll,int>> g[maxn]; vector<pair<ll,pair<int,int>>> edges; vector<int> a; ll dist[maxn]; void dijk() { for (int i=1; i<=n; i++) { dist[i] = inf; } priority_queue<pair<ll,int>> pq; for (int x: a) { dist[x] = 0; pq.push({0, x}); } while (pq.size()) { auto cur = pq.top(); pq.pop(); ll d = -cur.first; int at = cur.second; if (d > dist[at]) continue; for (auto ed: g[at]) { int to = ed.second; ll walk = d + ed.first; if (walk < dist[to]) { dist[to] = walk; pq.push({-dist[to],to}); } } } } int par[maxn]; vector<int> nodes[maxn]; vector<pair<ll,int>> trans[maxn]; void join(int u, int v, ll wei) { u = par[u]; v = par[v]; if (u == v) return; if (nodes[u].size()<nodes[v].size()) { swap(u,v); } while (nodes[v].size()) { int cur = nodes[v].back(); nodes[v].pop_back(); trans[cur].push_back({wei,u}); nodes[u].push_back(cur); par[cur] = u; } } ll solve(int u, int v) { if (trans[u].size()>trans[v].size()) { swap(u,v); } int ulen = trans[u].size(); int ans = 0; for (int i=1; i<=ulen; i++) { if (trans[u][ulen-i].second != trans[v][ulen-i].second) { break; } ans = min(trans[u][ulen-i].first, trans[v][ulen-i].first); } return ans; } int main() { ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); cin>>n>>m; for (int i=0; i<m; i++) { int u,v,w; cin>>u>>v>>w; g[u].push_back({w,v}); g[v].push_back({w,u}); edges.push_back({0,{u,v}}); } cin>>k; a.resize(k); for (int i=0; i<k; i++) { cin>>a[i]; } dijk(); for (auto &ed: edges) { int u = ed.second.first; int v = ed.second.second; ed.first = min(dist[u],dist[v]); } //dsu edges from hi to lo sort(edges.rbegin(), edges.rend()); for (int i=1; i<=n; i++) { par[i]=i; nodes[i].push_back(i); trans[i].push_back({inf,i}); } for (auto ed: edges) { int u = ed.second.first; int v = ed.second.second; join(u,v,ed.first); } int q; cin>>q; while (q--) { int u,v; cin>>u>>v; cout<<solve(u,v)<<"\n"; } return 0; }
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