#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 500100;
vector<int> g[N];
int n;
pair<int,int> dp[N];
pair<ll,ll> ans={0, 1};
void dfs1(int at, int p) {
dp[at] = {1, 1};
for(int to:g[at]) {
if(to==p)continue;
dfs1(to, at);
if(dp[to].first+1 > dp[at].first) {
dp[at]=dp[to];
dp[at].first++;
}
else if(dp[to].first+1 == dp[at].first) {
dp[at].second+=dp[to].second;
}
}
}
void dfs2(int at, int p) {
sort(g[at].begin(), g[at].end(), [&](int u, int v) {
return dp[u].first > dp[v].first;
});
if(g[at].size()>=3) {
int a = dp[g[at][0]].first, b = dp[g[at][1]].first, c = dp[g[at][2]].first;
int res = a*(b+c);
int cntb = 0, cntc = 0, totcnt=0;
for(int to:g[at]) {
if(c == dp[to].first)totcnt+=cntb*dp[to].second;
if(b == dp[to].first)cntb+=dp[to].second;
}
if(ans.first == res){
ans.second+=totcnt;
}
else if(ans.first < res) {
ans.first = res;
ans.second = totcnt;
}
}
pair<ll, ll> fr = {1, 1};
pair<ll, ll> sc = {1, 1};
for(int to:g[at]) {
if(fr.first < dp[to].first+1) {
fr=dp[to];
fr.first++;
}
else if(fr.first == dp[to].first+1) {
fr.second+=dp[to].second;
}
}
for(int to:g[at]) {
if(dp[to].first+1==fr.first)continue;
if(sc.first < dp[to].first+1) {
sc=dp[to];
sc.first++;
}
else if(sc.first == dp[to].first+1) {
sc.second+=dp[to].second;
}
}
for(int to:g[at]) {
if(to==p)continue;
if(fr.first == dp[to].first+1 and fr.second == dp[to].second) {
dp[at] = sc;
}
else if(fr.first == dp[to].first+1) {
dp[at] = fr;
dp[at].second -= dp[to].second;
}
else {
dp[at] = fr;
}
dfs2(to, at);
}
}
signed main () {
cin.tie(0)->sync_with_stdio(0);
cin >> n;
for(int i = 1;i<n;i++) {
int u, v;
cin >> u >> v;
g[u].push_back(v);
g[v].push_back(u);
}
dfs1(1, 0);
dfs2(1, 0);
cout << ans.first << " " << ans.second << "\n";
}
Compilation message
road.cpp: In function 'void dfs2(int, int)':
road.cpp:31:19: warning: unused variable 'cntc' [-Wunused-variable]
31 | int cntb = 0, cntc = 0, totcnt=0;
| ^~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
13656 KB |
Output is correct |
| 2 |
Correct |
3 ms |
13888 KB |
Output is correct |
| 3 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 4 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 5 |
Correct |
4 ms |
13888 KB |
Output is correct |
| 6 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 7 |
Correct |
3 ms |
13764 KB |
Output is correct |
| 8 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 9 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 10 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 11 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 12 |
Correct |
3 ms |
13912 KB |
Output is correct |
| 13 |
Correct |
4 ms |
13660 KB |
Output is correct |
| 14 |
Correct |
4 ms |
13660 KB |
Output is correct |
| 15 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 16 |
Correct |
3 ms |
13656 KB |
Output is correct |
| 17 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 18 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 19 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 20 |
Correct |
3 ms |
13884 KB |
Output is correct |
| 21 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 22 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 23 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 24 |
Correct |
3 ms |
13660 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
13656 KB |
Output is correct |
| 2 |
Correct |
3 ms |
13888 KB |
Output is correct |
| 3 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 4 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 5 |
Correct |
4 ms |
13888 KB |
Output is correct |
| 6 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 7 |
Correct |
3 ms |
13764 KB |
Output is correct |
| 8 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 9 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 10 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 11 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 12 |
Correct |
3 ms |
13912 KB |
Output is correct |
| 13 |
Correct |
4 ms |
13660 KB |
Output is correct |
| 14 |
Correct |
4 ms |
13660 KB |
Output is correct |
| 15 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 16 |
Correct |
3 ms |
13656 KB |
Output is correct |
| 17 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 18 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 19 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 20 |
Correct |
3 ms |
13884 KB |
Output is correct |
| 21 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 22 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 23 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 24 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 25 |
Correct |
5 ms |
14172 KB |
Output is correct |
| 26 |
Correct |
4 ms |
14168 KB |
Output is correct |
| 27 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 28 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 29 |
Correct |
3 ms |
14168 KB |
Output is correct |
| 30 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 31 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 32 |
Correct |
3 ms |
14168 KB |
Output is correct |
| 33 |
Correct |
3 ms |
14172 KB |
Output is correct |
| 34 |
Correct |
4 ms |
14168 KB |
Output is correct |
| 35 |
Correct |
4 ms |
14160 KB |
Output is correct |
| 36 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 37 |
Correct |
5 ms |
14408 KB |
Output is correct |
| 38 |
Correct |
4 ms |
14428 KB |
Output is correct |
| 39 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 40 |
Correct |
3 ms |
14172 KB |
Output is correct |
| 41 |
Correct |
4 ms |
13916 KB |
Output is correct |
| 42 |
Correct |
3 ms |
13916 KB |
Output is correct |
| 43 |
Correct |
4 ms |
13916 KB |
Output is correct |
| 44 |
Correct |
4 ms |
13912 KB |
Output is correct |
| 45 |
Correct |
4 ms |
13916 KB |
Output is correct |
| 46 |
Correct |
3 ms |
14020 KB |
Output is correct |
| 47 |
Correct |
3 ms |
14164 KB |
Output is correct |
| 48 |
Correct |
3 ms |
13916 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
3 ms |
13656 KB |
Output is correct |
| 2 |
Correct |
3 ms |
13888 KB |
Output is correct |
| 3 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 4 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 5 |
Correct |
4 ms |
13888 KB |
Output is correct |
| 6 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 7 |
Correct |
3 ms |
13764 KB |
Output is correct |
| 8 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 9 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 10 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 11 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 12 |
Correct |
3 ms |
13912 KB |
Output is correct |
| 13 |
Correct |
4 ms |
13660 KB |
Output is correct |
| 14 |
Correct |
4 ms |
13660 KB |
Output is correct |
| 15 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 16 |
Correct |
3 ms |
13656 KB |
Output is correct |
| 17 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 18 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 19 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 20 |
Correct |
3 ms |
13884 KB |
Output is correct |
| 21 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 22 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 23 |
Correct |
2 ms |
13660 KB |
Output is correct |
| 24 |
Correct |
3 ms |
13660 KB |
Output is correct |
| 25 |
Correct |
5 ms |
14172 KB |
Output is correct |
| 26 |
Correct |
4 ms |
14168 KB |
Output is correct |
| 27 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 28 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 29 |
Correct |
3 ms |
14168 KB |
Output is correct |
| 30 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 31 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 32 |
Correct |
3 ms |
14168 KB |
Output is correct |
| 33 |
Correct |
3 ms |
14172 KB |
Output is correct |
| 34 |
Correct |
4 ms |
14168 KB |
Output is correct |
| 35 |
Correct |
4 ms |
14160 KB |
Output is correct |
| 36 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 37 |
Correct |
5 ms |
14408 KB |
Output is correct |
| 38 |
Correct |
4 ms |
14428 KB |
Output is correct |
| 39 |
Correct |
4 ms |
14172 KB |
Output is correct |
| 40 |
Correct |
3 ms |
14172 KB |
Output is correct |
| 41 |
Correct |
4 ms |
13916 KB |
Output is correct |
| 42 |
Correct |
3 ms |
13916 KB |
Output is correct |
| 43 |
Correct |
4 ms |
13916 KB |
Output is correct |
| 44 |
Correct |
4 ms |
13912 KB |
Output is correct |
| 45 |
Correct |
4 ms |
13916 KB |
Output is correct |
| 46 |
Correct |
3 ms |
14020 KB |
Output is correct |
| 47 |
Correct |
3 ms |
14164 KB |
Output is correct |
| 48 |
Correct |
3 ms |
13916 KB |
Output is correct |
| 49 |
Correct |
254 ms |
53180 KB |
Output is correct |
| 50 |
Correct |
237 ms |
56404 KB |
Output is correct |
| 51 |
Correct |
271 ms |
59304 KB |
Output is correct |
| 52 |
Correct |
203 ms |
49232 KB |
Output is correct |
| 53 |
Incorrect |
224 ms |
54580 KB |
Output isn't correct |
| 54 |
Halted |
0 ms |
0 KB |
- |
