| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 1322304 | behrad | 동기화 (JOI13_synchronization) | C++20 | 0 ms | 0 KiB |
#ifndef ONLINE_JUDGE
#include "/home/bgopc/template/pch.hpp"
#endif
#include <bits/stdc++.h>
using namespace std;
// * No One Dies a Virgin, Life Fucks Us All
typedef long long ll;
#define nl '\n'
#define ff first
#define ss second
#define pb push_back
#define sik(x) {cout << x << nl; return;}
constexpr ll maxn = 2e5+10, mod = 1e9 + 7, inf = 1e17, SQ = 450, LG = 20;
typedef pair<int, int> pii;
int n, m, q, in[maxn], out[maxn], T = 1, big[maxn], sz[maxn], hd[maxn], h[maxn], par[maxn], ans[maxn], lst[maxn];
vector<int> g[maxn];
auto cmp = [] (int u, int v) { return in[u] < in[v]; };
set<int, decltype(cmp)> have[maxn];
// set<pii> have[maxn];
pii E[maxn];
void PreDfs(int v) {
big[v] = -1;
sz[v] = 1;
for (int &u : g[v]) {
g[u].erase(find(g[u].begin(), g[u].end(), v));
par[u] = v;
h[u] = h[v] + 1;
PreDfs(u);
sz[v] += sz[u];
if (big[v] == -1 || sz[u] > sz[big[v]]) {
big[v] = u;
swap(g[v][0], u);
}
}
}
void dfs(int v) {
in[v] = T ++;
for (int u : g[v]) {
hd[u] = u == big[v] ? hd[v] : u;
dfs(u);
}
out[v] = T;
}
inline bool upd(int e) {
auto [u, v] = E[e];
u = hd[u];
auto [it, f] = have[u].insert(v);
if (!f) have[u].erase(it);
return !f;
}
inline int root(int v) {
int u = v;
while (1) {
auto &s = have[hd[v]];
if (!s.empty()) {
auto it = s.upper_bound(u);
if (it != s.begin()) { --it; return *it; }
}
if (hd[v] == 1) return 1;
v = par[hd[v]];
}
}
int32_t main() {
cin.tie(0)->sync_with_stdio(0);
cin >> n >> m >> q;
for (int i = 1 , u ,v ; i <= n - 1 ; i ++) {
cin >> u >> v;
g[u].pb(v);
g[v].pb(u);
E[i] = {u, v};
}
PreDfs(1);
hd[1] = 1;
dfs(1);
for (int i = 1 ; i <= n ; i ++) ans[i] = 1;
for (int i = 1 ; i <= n - 1 ; i ++) {
if (h[E[i].ff] > h[E[i].ss]) swap(E[i].ff, E[i].ss);
upd(i);
}
for (int e ; m -- ; ) {
cin >> e;
auto [u, v] = E[e];
if (upd(e)) ans[root(u)] += ans[v] - lst[v];
else ans[v] = lst[v] = ans[root(u)];
}
for (int v ; q -- ; ) {
cin >> v;
cout << ans[root(v)] << nl;
}
return 0;
}