// In the Name of Allah
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define pii pair<int, int>
#define pb push_back
#define pp pop_back
#define all(x) x.begin(), x.end()
#define cln(x) sort(all(x)), x.resize(unique(all(x)) - x.begin())
#define unq(a, n); {vector<int> v; for(int i = 0; i < n; i++) v.pb(a[i]); cln(v); for (int i = 0; i < n; i++) a[i] = lower_bound(all(v), a[i]) - v.begin();}
const int N = 5e5 + 12, inf = 1e18 + 12;
vector<pii> g[N];
int sz[N], val[N], cpar[N], q, n;
set<pii> cdis[N];
bool mrk[N];
void dfs(int u, int par = -1) {
sz[u] = 1;
for (auto i: g[u])
if (i.F != par && !mrk[i.F]) {
dfs(i.F, u);
sz[u] += sz[i.F];
}
}
int find_centroid(int u, int c, int par = -1) {
for (auto i: g[u])
if (!mrk[i.F] && i.F != par && sz[i.F] > (c - 1) / 2)
return find_centroid(i.F, c, u);
return u;
}
void fill_cdis(int u, int cent, int c = 0, int par = -1) {
cdis[cent].insert({u, c});
for (auto i: g[u])
if (!mrk[i.F] && i.F != par)
fill_cdis(i.F, cent, c + i.S, u);
}
void decompose(int u, int par = -1) {
dfs(u);
u = find_centroid(u, sz[u]);
fill_cdis(u, u);
cpar[u] = par;
mrk[u] = true;
for (auto i: g[u])
if (!mrk[i.F])
decompose(i.F, u);
}
void Init(int c, int a[], int b[], int d[]) {
n = c;
for (int i = 1; i < n; i++) {
g[a[i]].pb({b[i], d[i]});
g[b[i]].pb({a[i], d[i]});
}
decompose(0);
fill(val, val + n, inf);
}
void add(int u, int v) {
if (u == -1)
return;
val[u] = min(val[u], cdis[u].lower_bound({v, -1})->S);
add(cpar[u], v);
}
int ask(int u, int v) {
if (u == -1)
return inf;
int tmp = cdis[u].lower_bound({v, -1})->S;
return min(ask(cpar[u], v), tmp + val[u]);
}
void rem(int u) {
val[u] = inf;
if (cpar[u] != -1)
rem(cpar[u]);
}
int Query(int s, int x[], int t, int y[]) {
for (int i = 0; i < s; i++)
add(x[i], x[i]);
int res = inf;
for (int i = 0; i < t; i++)
res = min(res, ask(y[i], y[i]));
for (int i = 0; i < s; i++)
rem(x[i]);
return res;
}
Compilation message
/usr/bin/ld: /tmp/ccZ0XWGO.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
