#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long
#define ld long double
// 217
// 44
using namespace std;
const int MAXN = (int) 5e5;
vector <int> g[MAXN + 1];
pair <int, int> down[MAXN + 1], up[MAXN + 1];
pair <ll, ll> ans = {0, 1};
inline void update(pair <int, int> &a, pair <int, int> b) {
if(b.second == 0) {
return ;
}
if(a.first < b.first) {
a = b;
}
else if(a.first == b.first) {
a.second += b.second;
}
}
inline void update(pair <int, ll> &a, pair <int, ll> b) {
if(b.second == 0) {
return ;
}
if(a.first < b.first) {
a = b;
}
else if(a.first == b.first) {
a.second += b.second;
}
}
inline void update(pair <ll, ll> &a, pair <ll, ll> b) {
if(b.second == 0) {
return ;
}
if(a.first < b.first) {
a = b;
}
else if(a.first == b.first) {
a.second += b.second;
}
}
void dfs_down(int nod, int par) {
down[nod] = {0, 1};
for(auto it : g[nod]) {
if(it != par) {
dfs_down(it, nod);
update(down[nod], {down[it].first + 1, down[it].second});
}
}
}
void dfs_up(int nod, int par) {
int sz = g[nod].size();
vector < pair <int, int> > pref(sz), suff(sz);
for(int i = 0; i < sz; i++) {
int it = g[nod][i];
if(i > 0) {
pref[i] = pref[i - 1];
}
if(it == par) {
continue;
}
update(pref[i], {down[it].first + 2, down[it].second});
}
for(int i = sz - 1; i >= 0; i--) {
int it = g[nod][i];
if(i < sz - 1) {
suff[i] = suff[i + 1];
}
if(it == par) {
continue;
}
update(suff[i], {down[it].first + 2, down[it].second});
}
for(int i = 0; i < sz; i++) {
int it = g[nod][i];
if(it != par) {
update(up[it], {up[nod].first + 1, up[nod].second});
if(i > 0) {
update(up[it], pref[i - 1]);
}
if(i < sz - 1) {
update(up[it], suff[i + 1]);
}
dfs_up(it, nod);
}
}
}
struct Data {
int mx1, cnt1, nr1;
ll s1;
int mx2, cnt2;
};
inline pair <int, ll> combine(Data a, Data b) {
pair <int, ll> ans = {0, 0};
if(a.nr1 > 1) {
update(ans, {2 * a.mx1, (1LL * a.cnt1 * a.cnt1 - a.s1) / 2});
}
if(b.nr1 > 1) {
update(ans, {2 * b.mx1, (1LL * b.cnt1 * b.cnt1 - b.s1) / 2});
}
update(ans, {a.mx1 + b.mx1, 1LL * a.cnt1 * b.cnt1});
update(ans, {a.mx1 + a.mx2, 1LL * a.cnt1 * a.cnt2});
update(ans, {b.mx1 + b.mx2, 1LL * b.cnt1 * b.cnt2});
return ans;
}
void solve(int nod, int par) {
int sz = g[nod].size();
vector <Data> pref(sz), suff(sz);
for(int i = 0; i < sz; i++) {
int it = g[nod][i];
if(i > 0) {
pref[i] = pref[i - 1];
}
if(it == par) {
continue;
}
if(pref[i].mx1 < down[it].first + 1) {
pref[i].mx2 = pref[i].mx1, pref[i].cnt2 = pref[i].cnt1;
pref[i].mx1 = down[it].first + 1, pref[i].cnt1 = down[it].second, pref[i].nr1 = 1, pref[i].s1 = 1LL * down[it].second * down[it].second;
}
else if(pref[i].mx1 == down[it].first + 1) {
pref[i].cnt1 += down[it].second, pref[i].nr1++, pref[i].s1 += 1LL * down[it].second * down[it].second;
}
else if(pref[i].mx2 < down[it].first + 1) {
pref[i].mx2 = down[it].first + 1, pref[i].cnt2 = down[it].second;
}
else if(pref[i].mx2 == down[it].first + 1) {
pref[i].cnt2 += down[it].second;
}
}
for(int i = sz - 1; i >= 0; i--) {
int it = g[nod][i];
if(i < sz - 1) {
suff[i] = suff[i + 1];
}
if(it == par) {
continue;
}
if(suff[i].mx1 < down[it].first + 1) {
suff[i].mx2 = suff[i].mx1, suff[i].cnt2 = suff[i].cnt1;
suff[i].mx1 = down[it].first + 1, suff[i].cnt1 = down[it].second, suff[i].nr1 = 1, suff[i].s1 = 1LL * down[it].second * down[it].second;
}
else if(suff[i].mx1 == down[it].first + 1) {
suff[i].cnt1 += down[it].second, suff[i].nr1++, suff[i].s1 += 1LL * down[it].second * down[it].second;
}
else if(suff[i].mx2 < down[it].first + 1) {
suff[i].mx2 = down[it].first + 1, suff[i].cnt2 = down[it].second;
}
else if(suff[i].mx2 == down[it].first + 1) {
suff[i].cnt2 += down[it].second;
}
}
pair <ll, ll> cur = combine(suff[0], {0, 0, 0, 0, 0, 0});
update(ans, {cur.first * up[nod].first, cur.second});
for(int i = 0; i < sz; i++) {
int it = g[nod][i];
if(it != par) {
solve(it, nod);
cur = {0, 0};
if(i == 0) {
if(i + 1 < sz)
cur = combine(suff[i + 1], {0, 0, 0, 0, 0, 0});
}
else if(i == sz - 1) {
if(i - 1 >= 0)
cur = combine(pref[i - 1], {0, 0, 0, 0, 0, 0});
}
else {
cur = combine(pref[i - 1], suff[i + 1]);
}
update(ans, {cur.first * (down[it].first + 1), cur.second});
}
}
}
int main() {
//ifstream cin("A.in");
//ofstream cout("A.out");
int i, n;
ios::sync_with_stdio(false);
cin.tie(0), cout.tie(0);
cin >> n;
for(i = 1; i < n; i++) {
int u, v;
cin >> u >> v;
g[u].push_back(v);
g[v].push_back(u);
}
int root;
for(i = 1; i <= n; i++) {
if(g[i].size() > 1) {
root = i;
break;
}
}
dfs_down(root, 0);
up[root] = {-MAXN, 0};
dfs_up(root, 0);
solve(root, 0);
cout << ans.first << " " << ans.second;
//cin.close();
//cout.close();
return 0;
}
Compilation message
road.cpp: In function 'int main()':
road.cpp:206:9: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
int root;
^~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 2 |
Correct |
10 ms |
12268 KB |
Output is correct |
| 3 |
Correct |
10 ms |
12296 KB |
Output is correct |
| 4 |
Correct |
10 ms |
12296 KB |
Output is correct |
| 5 |
Correct |
10 ms |
12296 KB |
Output is correct |
| 6 |
Runtime error |
22 ms |
24056 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 7 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 2 |
Correct |
10 ms |
12268 KB |
Output is correct |
| 3 |
Correct |
10 ms |
12296 KB |
Output is correct |
| 4 |
Correct |
10 ms |
12296 KB |
Output is correct |
| 5 |
Correct |
10 ms |
12296 KB |
Output is correct |
| 6 |
Runtime error |
22 ms |
24056 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 7 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 2 |
Correct |
10 ms |
12268 KB |
Output is correct |
| 3 |
Correct |
10 ms |
12296 KB |
Output is correct |
| 4 |
Correct |
10 ms |
12296 KB |
Output is correct |
| 5 |
Correct |
10 ms |
12296 KB |
Output is correct |
| 6 |
Runtime error |
22 ms |
24056 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 7 |
Halted |
0 ms |
0 KB |
- |
