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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#433019 | #3100. Meetings 2 | snpmrnhlol | 0 | 2ms | 9564kb | C++14 | 3.0kb | 2024-06-07 22:30:02 | 2024-06-07 22:30:03 |
answer
#include<bits/stdc++.h>
using namespace std;
const int N = 2e5;
const int inf = 2e9;
vector <int> e[N];
int bad[N];
int sub[N];
int gbsub[N];
int pr[N];
int ans[N + 1];
int n;
void dfs(int node, int p){
gbsub[node] = 1;
pr[node] = p;
for(auto i:e[node]){
if(i == p)continue;
dfs(i,node);
gbsub[node]+=gbsub[i];
}
}
int get(int node, int p){
if(pr[node] == p){
return gbsub[node];
}else{
return n - gbsub[p];
}
}
void cendecomp(int node){
vector <array<int,4>> nodes;
int sz = 0;
int cen = -1,cennr = inf;
auto dfs = [&](auto self, int node, int p) -> void{
sz++;
for(auto i:e[node]){
if(i == p || bad[i])continue;
self(self, i, node);
}
};
auto dfs2 = [&](auto self, int node, int p) -> void{
sub[node] = 1;
int mx = -1;
for(auto i:e[node]){
if(i == p || bad[i])continue;
self(self, i, node);
sub[node]+=sub[i];
mx = max(mx,sub[i]);
}
mx = max(mx,sz - sub[node]);
if(mx < cennr){
mx = cennr;
cen = node;
}
};
auto dfs3 = [&](auto self, int node, int p, int dpth, int orig) -> void{
int nr = min(get(node,p),get(cen,orig));
cout<<node<<' '<<cen<<' '<<dpth<<'\n';
ans[2*nr] = max(dpth,ans[2*nr]);
for(auto i:e[node]){
if(i == p || bad[i])continue;
self(self, i, node, dpth + 1, orig);
}
};
auto dfs4 = [&](auto self, int node, int p, int dpth, int orig) -> void{
nodes.push_back({orig,dpth,get(node,p),node});
for(auto i:e[node]){
if(i == p || bad[i])continue;
self(self, i, node, dpth + 1, orig);
}
};
dfs(dfs, node, -1);
dfs2(dfs2, node, -1);
for(auto i:e[cen]){
if(bad[i])continue;
dfs3(dfs3, i, cen, 2, i);
dfs4(dfs4, i, cen, 1, i);
}
for(int i = 0;i < nodes.size();i++){
for(int j = 0;j < nodes.size();j++){
if(nodes[i][0] == nodes[j][0])continue;
//cout<<nodes[i][3]<<' '<<nodes[j][3]<<' '<<nodes[i][1] + nodes[j][1] + 1<<' '<<cen<<' '<<nodes[i][2]<<' '<<nodes[j][2]<<'\n';
ans[2*min(nodes[i][2],nodes[j][2])] = max(ans[2*min(nodes[i][2],nodes[j][2])],nodes[i][1] + nodes[j][1] + 1);
}
}
bad[cen] = 1;
for(auto i:e[cen]){
if(bad[i])continue;
cendecomp(i);
}
}
void solve(){
cin>>n;
for(int i = 0;i < n - 1;i++){
int u,w;
cin>>u>>w;
u--;w--;
e[w].push_back(u);
e[u].push_back(w);
}
dfs(0, -1);
cendecomp(0);
for(int i = n;i >= 2;i--){
if(i%2 == 0)ans[i] = max(ans[i],ans[i + 2]);
}
for(int i = 1;i <= n;i++){
if(i%2 == 1)cout<<1<<'\n';
else{
cout<<ans[i]<<'\n';
}
}
}
int main(){
int t;
t = 1;
while(t--)solve();
return 0;
}
Details
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Subtask #1:
score: 0
Wrong Answer
Test #1:
score: 4
Accepted
time: 2ms
memory: 8464kb
input:
1
output:
1
result:
ok single line: '1'
Test #2:
score: 0
Wrong Answer
time: 0ms
memory: 9564kb
input:
2 2 1
output:
1 0 2 1 2
result:
wrong answer 1st lines differ - expected: '1', found: '1 0 2'
Subtask #2:
score: 0
Skipped
Dependency #1:
0%
Subtask #3:
score: 0
Skipped
Dependency #1:
0%