#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MX = 2e5 + 5;
int N, Q;
ll sz[MX], ans[MX];
bool removed[MX];
vector<pair<int,int>> g[MX];
int getSize(int v, int p) {
sz[v] = 1;
for(auto [u, w] : g[v]) {
if(u == p || removed[u]) continue;
sz[v] += getSize(u, v);
}
return sz[v];
}
int getCentroid(int v, int p, int size) {
for(auto [u, w] : g[v]) {
if(u != p && sz[u] > size / 2 && !removed[u]) {
return getCentroid(u, v, size);
}
}
return v;
}
vector<pair<ll,ll>> ancestors[MX];
void getDists(int v, int centroid, int p, int curDist) {
for(auto [u, w] : g[v]) {
if(u == p || removed[u]) continue;
getDists(u, centroid, v, curDist + w);
}
ancestors[v].push_back({centroid, curDist});
}
void build(int v) {
int centroid = getCentroid(v, -1, getSize(v, -1));
for(auto [u, w] : g[centroid]) {
if(removed[u]) continue;
getDists(u, centroid, centroid, w);
}
removed[centroid] = 1;
for(auto [u, w] : g[centroid]) {
if(removed[u]) continue;
build(u);
}
}
int main() {
cin.tie(0); ios_base::sync_with_stdio(0);
for(int i = 0; i < MX; i++) ans[i] = 1e18;
cin >> N >> Q;
for(int i = 0; i < N - 1; i++) {
int u, v, w;
cin >> u >> v >> w;
g[u].push_back({v, w});
g[v].push_back({u, w});
}
build(1);
for(int i = 1; i <= N; i++) ancestors[i].push_back({i, 0});
for(int i = 0; i < Q; i++) {
int s, t;
cin >> s >> t;
vector<int> R;
for(int i = 0; i < s; i++) {
int x;
cin >> x;
for(auto [y, d] : ancestors[x]) {
R.push_back(y);
ans[y] = min(ans[y], d);
}
}
ll res = 1e18;
for(int i = 0; i < t; i++) {
int x;
cin >> x;
for(auto [y, d] : ancestors[x]) {
res = min(res, d + ans[y]);
}
}
cout << res << '\n';
for(auto x : R) ans[x] = 1e18;
}
}
Compilation message
/usr/bin/ld: /tmp/ccixU7sD.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccHlobgF.o:factories.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccixU7sD.o: in function `main':
grader.cpp:(.text.startup+0x37d): undefined reference to `Init(int, int*, int*, int*)'
/usr/bin/ld: grader.cpp:(.text.startup+0x412): undefined reference to `Query(int, int*, int, int*)'
collect2: error: ld returned 1 exit status
