#include <bits/stdc++.h>
using namespace std;
const int N = 1e5;
vector<int> adj[N];
int tin[N],tout[N],segt[2*N],pere[20][N],res[N],status[N];
int t = 0;
void dfs(int node, int p){
tin[node] = t;
t++;
for (int i:adj[node]){
if (i != p){
pere[0][i] = node;
dfs(i,node);
}
}
tout[node] = t;
}
void modify(int node, int val){
node += N;
segt[node] = val;
node >>= 1;
while (node){
segt[node] = segt[2*node]+segt[2*node+1];
node >>= 1;
}
}
int query(int deb, int fin){
deb += N;
fin += N;
int ans = 0;
while (deb <= fin){
if (deb&1){
ans += segt[deb];
deb++;
}
if (fin%2 == 0){
ans += segt[fin];
fin--;
}
}
return ans;
}
int getRoot(int node){
for (int i=19; i>=0; --i){
if (query(tin[node],tin[pere[i][node]]-1) == 0){
node = pere[i][node];
}
}
return node;
}
int main(){
ios::sync_with_stdio(0);
cin.tie(0);
int n,m,q;
cin >> n >> m >> q;
vector<pair<int,int>> edges;
for (int i=1; i<n; ++i){
int u,v;
cin >> u >> v;
edges.emplace_back(u,v);
adj[u].emplace_back(v);
adj[v].emplace_back(u);
}
vector<int> event;
for (int i=0; i<m; ++i){
int a;
cin >> a;
a--;
event.emplace_back(a);
}
int root = 0;
for (int i=0; i<q; ++i){
cin >> root;
}
root--;
for (int i=0; i<n; ++i){
modify(i,1);
res[i] = 1;
status[i] = 1;
}
dfs(root,-1);
for (int i=1; i<20; ++i){
for (int node=0; node<n; ++node){
pere[i][node] = pere[i-1][pere[i-1][node]];
}
}
for (int i=0; i<m; ++i){
int u = edges[event[i]].first, v = edges[event[i]].second;
modify(i,1-status[v]);
status[v] = 1-status[v];
modify(i,1-status[u]);
status[u] = 1-status[u];
if (status[i] == 1){
res[getRoot(u)] += res[v];
res[v] = 0;
}
}
cout << res[getRoot(root)];
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
2 ms |
2772 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
8100 ms |
22916 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
2 ms |
2804 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Execution timed out |
8080 ms |
26796 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
1 ms |
2772 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |