#include <bits/stdc++.h>
#define fr(i, a, b) for (int i = (a); i <= (b); ++i)
#define rf(i, a, b) for (int i = (a); i >= (b); --i)
#define fe(x, y) for (auto& x : y)
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define mt make_tuple
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define pw(x) (1LL << (x))
using namespace std;
mt19937_64 rng(228);
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template <typename T>
using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define fbo find_by_order
#define ook order_of_key
template <typename T>
bool umn(T& a, T b) {
return a > b ? a = b, 1 : 0;
}
template <typename T>
bool umx(T& a, T b) {
return a < b ? a = b, 1 : 0;
}
using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
template <typename T>
using ve = vector<T>;
const int N = 1e5 + 5;
int n;
ve<int> g[N];
int dist[1001][1001];
int start;
void dfs(int v, int p, int dep) {
dist[start][v] = dep;
fe (to, g[v]) {
if (to == p) continue;
dfs(to, v, dep + 1);
}
}
int p[N];
ve<int> order;
void dfs1(int v = 1, int p = 0) {
::p[v] = p;
fe (to, g[v]) {
if (to == p) continue;
dfs1(to, v);
}
order.pb(v);
}
void assertTL(bool b) {
if (!b) {
while (1);
}
}
int main() {
#ifdef LOCAL
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#else
ios::sync_with_stdio(0);
cin.tie(0);
#endif
cin >> n;
fr (i, 1, n - 1) {
int a, b;
cin >> a >> b;
g[a].pb(b);
g[b].pb(a);
}
if (n <= 1000) {
for (start = 1; start <= n; start++) {
dfs(start, 0, 0);
}
}
dfs1();
ll mySum = -1;
{
ve<bool> used(n + 1);
ve<int> to(n + 1);
fe (v, order) {
ve<int> sons;
fe (to, g[v]) {
if (to == p[v]) continue;
if (!used[to]) {
sons.pb(to);
}
}
while (sz(sons) > 1) {
used[sons.back()] = 1;
used[sons[sz(sons) - 2]] = 1;
to[sons.back()] = sons[sz(sons) - 2];
to[sons[sz(sons) - 2]] = sons.back();
sons.pop_back();
sons.pop_back();
}
if (sz(sons)) {
used[sons.back()] = 1;
used[v] = 1;
to[sons.back()] = v;
to[v] = sons.back();
sons.pop_back();
}
}
if (n % 2) {
assertTL(!to[1]);
bool found = 0;
fe (u, g[1]) {
if (p[to[u]] == 1) {
int v = to[u];
to[v] = 1;
to[1] = u;
to[u] = v;
found = 1;
break;
}
}
if (!found) {
fe (u, g[1]) {
int v = to[u];
to[1] = u;
to[u] = v;
to[v] = 1;
break;
}
}
}
ll sum = 0;
fr (i, 1, n) {
sum += dist[i][to[i]];
assertTL(dist[i][to[i]] <= 2);
}
set<int> s;
fr (i, 1, n) {
s.insert(to[i]);
assertTL(to[i] != i);
}
assertTL(sz(s) == n);
mySum = sum;
// cout << sum << "\n";
// fr (i, 1, n) {
// cout << to[i] << " ";
// }
// cout << "\n";
}
{
ll mx = -1e18;
ve<int> mxP;
ll mn = 1e18;
ve<int> mnP;
ve<int> p;
fr (i, 1, n) p.pb(i);
do {
bool bad = 0;
fr (i, 0, sz(p) - 1) {
bad |= p[i] == i + 1;
}
if (!bad) {
ll sum = 0;
fr (i, 0, sz(p) - 1) {
sum += dist[i + 1][p[i]];
}
if (umx(mx, sum)) {
mxP = p;
}
bad = 0;
if (!bad) {
if (umn(mn, sum)) {
mnP = p;
}
}
}
} while (next_permutation(all(p)));
assert(mySum == mn);
cout << mn << " " << mx << "\n";
fe (x, mnP) cout << x << " ";
cout << "\n";
fr (i, 0, sz(mnP) - 1) {
assert(dist[i + 1][mnP[i]] <= 2);
}
fe (x, mxP) cout << x << " ";
cout << "\n";
cout << "\n";
}
return 0;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 2 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 3 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 4 |
Correct |
1 ms |
2644 KB |
Output is correct |
| 5 |
Correct |
1 ms |
2644 KB |
Output is correct |
| 6 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 7 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 8 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 9 |
Correct |
9 ms |
2716 KB |
Output is correct |
| 10 |
Correct |
72 ms |
2696 KB |
Output is correct |
| 11 |
Correct |
72 ms |
2700 KB |
Output is correct |
| 12 |
Correct |
72 ms |
2700 KB |
Output is correct |
| 13 |
Runtime error |
75 ms |
5324 KB |
Execution killed with signal 6 |
| 14 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Execution timed out |
1097 ms |
3668 KB |
Time limit exceeded |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 2 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 3 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 4 |
Correct |
1 ms |
2644 KB |
Output is correct |
| 5 |
Correct |
1 ms |
2644 KB |
Output is correct |
| 6 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 7 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 8 |
Correct |
2 ms |
2644 KB |
Output is correct |
| 9 |
Correct |
9 ms |
2716 KB |
Output is correct |
| 10 |
Correct |
72 ms |
2696 KB |
Output is correct |
| 11 |
Correct |
72 ms |
2700 KB |
Output is correct |
| 12 |
Correct |
72 ms |
2700 KB |
Output is correct |
| 13 |
Runtime error |
75 ms |
5324 KB |
Execution killed with signal 6 |
| 14 |
Halted |
0 ms |
0 KB |
- |
