#include<bits/stdc++.h>
#define f first
#define s second
#define pii pair<int,int>
#define Pii pair<pair<int,int> , pair<int,int> >
using namespace std;
const int N = 2e5 + 5, mod = 1e9 + 7; // !
int t, sz[N], f[N], h;
int n, c;
int ans[N];
vector<pair<int, pair<int,int> > > x;
vector<int> V[N];
int find(int u,int p, int Sz) {
for(int i = 0; i< V[u].size(); i++) {
if(V[u][i] == p|| f[V[u][i]]) continue;
if(sz[V[u][i]] > Sz / 2) return find(V[u][i], u, Sz);
}
return u;
}
void dfs(int u, int p) {
sz[u] = 1;
for(int i = 0; i < V[u].size(); i++) {
if(V[u][i] == p || f[V[u][i]]) continue;
dfs(V[u][i], u);
sz[u] += sz[V[u][i]];
}
}
void dfs(int u,int p,int P) {
++h;
x.push_back({sz[u], {h, P}});
ans[min(sz[u], n - sz[P]) * 2] = max(ans[min(sz[u], n - sz[P]) * 2], h + 1);
for(int i = 0; i < V[u].size(); i++) {
if(V[u][i] == p || f[V[u][i]]) continue;
dfs(V[u][i], u, P);
}
--h;
}
void upd(Pii &mx, pii x) {
if(x.s == mx.f.s) mx.f = max(mx.f, x);
else mx.s = max(mx.s, x);
if(mx.f.f < mx.s.f) swap(mx.s, mx.f);
}
void decomp(int U) {
dfs(U, 0);
c = U;
for(int i = 0; i < V[c].size(); i++) {
if(f[V[c][i]] == 0) dfs(V[c][i], c, V[c][i]);
}
pair<pii, pii> mx;
mx = {{-n, 0}, {-n, 0}};
sort(x.begin(), x.end());
while(x.size()) {
int i = x.back().f;
pii y = x.back().s;
ans[i * 2] = max(ans[i * 2], y.f + (mx.f.s != y.s ? mx.f.f : mx.s.f ) + 1);
upd(mx, y);
x.pop_back();
}
return;
f[c] = 1;
for(int i = 0; i < V[c].size(); i++) {
if(!f[V[c][i]]) decomp(V[c][i]);
}
}
main(){
cin >> n;
for(int i = 1; i < n; i++) {
int u, v;
cin >> u >> v;
V[u].push_back(v);
V[v].push_back(u);
}
// dfss(1, 0);
for(int i = 1; i <= n; i++)
decomp(i);
for(int i = n; i >= 1; i--) {
ans[i] = (i % 2 == 0 ? max(ans[i], ans[i + 2]) : 1);
}
for(int i = 1; i <= n; i++) {
cout << ans[i] << "\n";
}
}
Compilation message
meetings2.cpp: In function 'int find(int, int, int)':
meetings2.cpp:14:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
14 | for(int i = 0; i< V[u].size(); i++) {
| ~^~~~~~~~~~~~~
meetings2.cpp: In function 'void dfs(int, int)':
meetings2.cpp:22:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
22 | for(int i = 0; i < V[u].size(); i++) {
| ~~^~~~~~~~~~~~~
meetings2.cpp: In function 'void dfs(int, int, int)':
meetings2.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
32 | for(int i = 0; i < V[u].size(); i++) {
| ~~^~~~~~~~~~~~~
meetings2.cpp: In function 'void decomp(int)':
meetings2.cpp:46:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
46 | for(int i = 0; i < V[c].size(); i++) {
| ~~^~~~~~~~~~~~~
meetings2.cpp:62:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
62 | for(int i = 0; i < V[c].size(); i++) {
| ~~^~~~~~~~~~~~~
meetings2.cpp: At global scope:
meetings2.cpp:66:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
66 | main(){
| ^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 4 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 5 |
Incorrect |
2 ms |
4948 KB |
Output isn't correct |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 4 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 5 |
Incorrect |
2 ms |
4948 KB |
Output isn't correct |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 3 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 4 |
Correct |
3 ms |
4948 KB |
Output is correct |
| 5 |
Incorrect |
2 ms |
4948 KB |
Output isn't correct |
| 6 |
Halted |
0 ms |
0 KB |
- |
