#include"factories.h"
#include<bits/stdc++.h>
#define fo(i,d,c) for(int i=d;i<=c;i++)
#define fod(i,c,d) for(int i=c;i>=d;i--)
#define maxn 1000010
#define int long long
#define pb emplace_back
#define inf 1000000000
#define pii pair<long long ,long long >
#define vii vector<pii>
#define vi vector<long long >
using namespace std;
vii ke[maxn];
long long par[maxn][20],sz[maxn],h[maxn],d[maxn];
long long ind[maxn],head[maxn],cnt = 1;
vector<array<long long ,3>> adj[maxn];
void dfs(long long u,long long parent)
{
sz[u] = 1;
for(auto [v,w] : ke[u])
{
if(v == parent) continue;
par[v][0] = u;
h[v] = h[u] + 1;
d[v] = d[u] + w;
dfs(v,u);
sz[u] += sz[v];
}
}
void hld(long long u,long long parent)
{
if(head[cnt] == 0) head[cnt] = u;
ind[u] = cnt;
long long sc = -1,maxx = -1;
for(auto [v,w] : ke[u]) if(v != parent)
{
if(maxx < sz[v])
{
maxx = sz[v];
sc = v;
}
}
if(sc != -1) hld(sc,u);
for(auto [v,w] : ke[u]) if(v != parent and v != sc)
{
cnt++;
hld(v,u);
}
}
void get(int u,int t)
{
int val = d[u];
int uchain,vchain = ind[1];
while(1)
{
uchain = ind[u];
adj[uchain].push_back({u,val,t});
if(uchain == vchain) return;
u = ind[u];
u = par[head[u]][0];
}
}
void Init(int N,int A[],int B[],int D[])
{
fo(i,0,N - 2)
{
ke[A[i] + 1].pb(B[i] + 1,D[i]);
ke[B[i] + 1].pb(A[i] + 1,D[i]);
}
dfs(1,1);
hld(1,1);
}
long long Query(int S, int X[], int T, int Y[])
{
long long ans = 2e18;
fo(i,0,S - 1) get(X[i] + 1,0);
fo(i,0,T - 1) get(Y[i] + 1,1);
fo(i,1,cnt)
{
long long minn[2];
minn[0] = minn[1] = 2e18;
sort(adj[i].begin(),adj[i].end(),[](array<long long ,3> a,array<long long ,3> b)
{
return d[a[0]] > d[b[0]];
});
for(auto [v,dist,t] : adj[i])
{
ans = min(ans,minn[1 - t] - 2 * d[v] + dist);
minn[t] = min(minn[t],dist);
}
adj[i].clear();
}
return ans;
}
Compilation message
/usr/bin/ld: /tmp/ccxHPElw.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
