/**
* Author: Anil Byar
**/
#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
// template<class T>
// using ordered_set = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x).size()
#define ft first
#define sd second
#define pb push_back
// Source: https://codeforces.com/blog/entry/68809
// { start
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '"' << x << '"';}
void __print(const string &x) {cerr << '"' << x << '"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
// } end
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<pll> vll;
typedef vector<vi> vvi;
typedef vector<vii> vvii;
typedef vector<vl> vvl;
#define dbg if(0)
const ll MOD = 1e9+7;
const ll MOD9 = 998244353;
const ll INFLL = 1e18+5;
const int INF = 1e9;
const int maxN = 5e5+5;
const int maxK = 21;
void printbit(int x, int len) {string s="\n";while(len--){s=((x%2)?'1':'0')+s;x/=2;} cout<<s;}
ll gcd(ll a, ll b) {if (b > a) {return gcd(b, a);} if (b == 0) {return a;} return gcd(b, a % b);}
ll expo(ll a, ll b, ll mod) {ll res = 1; while (b > 0) {if (b & 1)res = (res * a) % mod; a = (a * a) % mod; b = b >> 1;} return res;}
void extendgcd(ll a, ll b, ll*v) {if (b == 0) {v[0] = 1; v[1] = 10; v[2] = a; return ;} extendgcd(b, a % b, v); ll x = v[1]; v[1] = v[0] - v[1] * (a / b); v[0] = x; return;} //pass an arry of size1 3
ll mod_add(ll a, ll b, ll m) {a = a % m; b = b % m; return (((a + b) % m) + m) % m;}
ll mod_mul(ll a, ll b, ll m) {a = a % m; b = b % m; return (((a * b) % m) + m) % m;}
ll mod_sub(ll a, ll b, ll m) {a = a % m; b = b % m; return (((a - b) % m) + m) % m;}
ll mminv(ll a, ll b) {ll arr[3]; extendgcd(a, b, arr); return mod_add(arr[0], 0, b);} //for non prime b
template<class T>
istream& operator>>(istream&in, vector<T>&v){
for (T& x:v) in>>x;
return in;
}
template<class T>
ostream& operator<<(ostream&out, vector<T>&v){
for (T& x:v) out<<x<<' ';
cout<<'\n';
return out;
}
struct Edge{
int v, w;
bool operator==(Edge e){
return v==e.v;
}
};
int n, m;
ll ans;
ll mdinv[maxN];
ll dist(int a, int b);
struct Centroid{
std::vector<std::vector<Edge>> adj;
std::vector<int> parent, stree;
const long long INF = 1e9;
vector<ll> nearest;
Centroid(std::vector<std::vector<Edge>>& _adj):adj(_adj){
parent.resize((int)_adj.size());
stree.resize((int)_adj.size());
nearest.assign((int)_adj.size(), INFLL);
}
void build(int node = 1, int par = -1){
int n = dfssize(node, par);
int centroid = dfscentroid(node, par, n);
parent[centroid] = par;
auto tmp = adj[centroid];
adj[centroid].clear();
for (Edge y:tmp) {
int x = y.v;
Edge tmp = {centroid, -1};
adj[x].erase(find(all(adj[x]), tmp));
build(x, centroid);
}
}
int dfssize(int node, int par){
stree[node] = 1;
for (Edge y:adj[node]){
int x = y.v;
if (x==par) continue;
dfssize(x, node);
stree[node] += stree[x];
}
return stree[node];
}
int dfscentroid(int node, int par, int n){
for (Edge y:adj[node]){
int x = y.v;
if (x==par) continue;
if (stree[x]>n/2) return dfscentroid(x, node, n);
}
return node;
}
void color(int node){
nearest[node] = 0;
int temp = node;
while(parent[node]!=-1){
nearest[parent[node]] = min(nearest[parent[node]], dist(temp, parent[node]));
node = parent[node];
}
}
void decolor(int node){
nearest[node] = INFLL;
int temp = node;
while(parent[node]!=-1){
nearest[parent[node]] = INFLL;
node = parent[node];
}
}
ll getnearest(int node){
ll ret = nearest[node];
int temp = node;
while(parent[node]!=-1){
node = parent[node];
ret = min(ret, dist(temp, node) + nearest[node]);
}
return ret;
}
};
vector<vector<Edge>> adj;
int par[maxN][maxK];
int dep[maxN];
ll depth[maxN];
void dfs(int node, int p){
for (Edge y:adj[node]){
int x = y.v;
if (x==p) continue;
par[x][0] = node;
dep[x] = dep[node] + 1;
depth[x] = depth[node] + y.w;
dfs(x, node);
}
}
int kup(int node, int h){
for (int i = 0;i<maxK;i++){
if ((h>>i)&1) node = par[node][i];
}
return node;
}
int lca(int x, int y){
if (dep[x]>dep[y]) swap(x, y);
y = kup(y, dep[y]-dep[x]);
if (x==y) return x;
for (int i = maxK-1;i>=0;i--){
if (par[x][i]!=par[y][i]) x = par[x][i], y = par[y][i];
}
return par[x][0];
}
ll dist(int u, int v){
return depth[u]+depth[v]-2*depth[lca(u, v)];
}
void solve(){
cin>>n>>m;
adj.resize(n);
for (int i = 0;i<n-1;i++){
int u, v, w;cin>>u>>v>>w;
adj[u].pb({v, w});
adj[v].pb({u, w});
}
dfs(0, -1);
for (int j = 1;j<maxK;j++){
for (int i = 0;i<n;i++) par[i][j] = par[par[i][j-1]][j-1];
}
Centroid ctr(adj);
ctr.build(0, -1);
while(m--){
int s, t;cin>>s>>t;
vi a(s);
for (int i = 0;i<s;i++) {
cin>>a[i];
ctr.color(a[i]);
}
ll res = INFLL;
for (int i = 0; i<t; i++){
int x;cin>>x;
res = min(res, ctr.getnearest(x));
}
for (int i = 0;i<s;i++) {
ctr.decolor(a[i]);
}
cout<<res<<'\n';
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
// #define _DEBUG
#ifdef _DEBUG
freopen("input.in", "r", stdin);
freopen("output.out", "w", stdout);
int tt = clock();
#endif
int t=1, i = 1;
// cin>>t;
ll x = 1;
while(t--){
// cout<<"Case #"<<i++<<": ";
solve();
cout<<'\n';
}
#ifdef _DEBUG
cerr << "TIME = " << (float)(clock() - tt)/CLOCKS_PER_SEC << endl;
tt = clock();
#endif
}
Compilation message
factories.cpp: In member function 'void Centroid::decolor(int)':
factories.cpp:172:13: warning: unused variable 'temp' [-Wunused-variable]
172 | int temp = node;
| ^~~~
factories.cpp: In function 'int main()':
factories.cpp:276:14: warning: unused variable 'i' [-Wunused-variable]
276 | int t=1, i = 1;
| ^
factories.cpp:278:8: warning: unused variable 'x' [-Wunused-variable]
278 | ll x = 1;
| ^
/usr/bin/ld: /tmp/cct8AtPL.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccWJQ3HK.o:factories.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cct8AtPL.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
