#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define ll long long int
#define pii pair<int,ll>
#define f first
#define s second
const int mxN = 5*1e5;
const ll llmax = (ll) 1e17;
vector<pii> adj[mxN];
vector<pii> ctree[mxN];
int ssize[mxN];
ll res[mxN];
bool vis[mxN];
void dfs(int node, int p){
ssize[node] = 1;
for (pii next : adj[node]){
if (next.f == p || vis[next.f]){
continue;
}
dfs(next.f,node);
ssize[node] += ssize[next.f];
}
}
void dfs2(int node, int p, int cent, ll cdepth){
ctree[node].pb({cent,cdepth});
for (pii next : adj[node]){
if (next.f == p || vis[next.f]){
continue;
}
dfs2(next.f,node,cent,cdepth+next.s);
}
}
int gcentroid(int node, int p, int tot){
for (pii next : adj[node]){
if (next.f == p || vis[next.f]){
continue;
}
if (ssize[next.f] > tot){
return gcentroid(next.f,node,tot);
}
}
return node;
}
void cdecomp(int node){
dfs(node,-1);
int centroid = gcentroid(node,-1,ssize[node]/2);
dfs2(centroid,-1,centroid,0);
vis[centroid] = 1;
for (pii next : adj[centroid]){
if (!vis[next.f]){
cdecomp(next.f);
}
}
}
void upd(int node, bool w){
for (pii next : ctree[node]){
if (w){
res[next.f] = min(res[next.f],next.s);
} else {
res[next.f] = llmax;
}
}
}
ll query(int node){
ll tot = llmax;
for (pii next : ctree[node]){
tot = min(tot, next.s + res[next.f]);
}
return tot;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n,q;
cin >> n >> q;
int a,b,d;
for (int i =0; i < n-1; i++){
cin >> a >> b >> d;
adj[a].pb({b,d});
adj[b].pb({a,d});
}
memset(vis,0,sizeof(vis));
cdecomp(0);
for (int i = 0; i < n; i++){
res[i] = llmax;
}
int s,t;
ll tot;
vector<int> temp;
for (int i =0; i < q; i++){
cin >> s >> t;
tot = llmax;
temp.clear();
for (int j = 0; j < s; j++){
cin >> a;
upd(a,true);
temp.pb(a);
}
for (int j = 0; j < t; j++){
cin >> a;
tot = min(tot, query(a));
}
for (int j =0; j < s; j++){
upd(temp[j],false);
}
cout << tot << '\n';
}
return 0;
}
Compilation message
/usr/bin/ld: /tmp/ccKTSLGl.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccb9Abel.o:factories.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccKTSLGl.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
