Submission #1082909

#TimeUsernameProblemLanguageResultExecution timeMemory
1082909pemguimnFactories (JOI14_factories)C++14
18 / 100
8053 ms146516 KiB
#include <bits/stdc++.h> // #include "factories.h" using namespace std; const int maxN = 5e5 + 5, LOG = 20; const long long INF = (long long) 1e18 + 5; vector<pair<int, int>> adj[maxN]; int h[maxN], par[LOG][maxN]; long long w[maxN]; void dfs(int i, int pre){ for(pair<int, int> e : adj[i]){ int x = e.first, c = e.second; if(x == pre) continue; h[x] = h[i] + 1, w[x] = w[i] + c; par[0][x] = i; for(int j = 1; j < LOG; j++) par[j][x] = par[j - 1][par[j - 1][x]]; dfs(x, i); } } int lca(int x, int y){ if(h[x] < h[y]) swap(x, y); int d = h[x] - h[y]; for(int i = 0; i < LOG; i++){ if(d & (1 << i)) x = par[i][x]; } if(x == y) return x; for(int i = LOG - 1; i >= 0; i--){ if(par[i][x] != par[i][y]) x = par[i][x], y = par[i][y]; } return par[0][x]; } void Init(int N, int A[], int B[], int D[]){ for(int i = 0; i < N - 1; i++){ adj[A[i]].push_back({B[i], D[i]}); adj[B[i]].push_back({A[i], D[i]}); } dfs(0, 0); } long long Query(int S, int X[], int T, int Y[]){ long long ans = INF; for(int i = 0; i < S; i++){ for(int j = 0; j < T; j++){ ans = min(ans, w[X[i]] + w[Y[j]] - 2 * w[lca(X[i], Y[j])]); } } return ans; } //void local(){ // int n, q; // cin >> n >> q; // for(int i = 0; i < n - 1; i++){ // int x, y, z; cin >> x >> y >> z; // adj[x].push_back({y, z}), adj[y].push_back({x, z}); // } // dfs(0, 0); // for(int i = 1; i <= q; i++){ // vector<int> X, Y; // int s, t; // cin >> s >> t; // while(s--) {int x; cin >> x; X.push_back(x);} // while(t--) {int x; cin >> x; Y.push_back(x);} // // long long ans = INF; // for(int x : X){ // for(int y : Y){ // ans = min(ans, w[x] + w[y] - 2LL * w[lca(x, y)]); // } // } // cout << ans << '\n'; // } //} //int main(){ // ios_base::sync_with_stdio(0); cin.tie(0); // // local(); // return 0; //}
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