#include<bits/stdc++.h>
#define int long long
#define pii pair<long long, long long>
using namespace std;
int n, minn = 0, maxx = 0;
vector<vector<int> >G;
vector<int>minans;
vector<int>maxans;
bool dfs(int x, int p) {
vector<int>c;
for (auto i : G[x]) {
if (i == p) continue;
bool can = dfs(i, x);
if (can) {
c.push_back(i);
}
}
//cout << x <<" " << c.size() << "\n";
for (int i = 0 ; i < c.size()/2 ; i++) {
minn += 4;
minans[c[i*2]] = c[i*2+1];
minans[c[i*2+1]] = c[i*2];
}
if (c.size() % 2 == 1) {
minn += 2;
minans[c.back()] = x;
minans[x] = c.back();
return 0;
} else {
if (x == 0) {
if (c.size() > 0) {
minans[c[0]] = x;
minans[x] = c[1];
} else {
minn += 2;
minans[x] = minans[G[x][0]];
minans[G[x][0]] = x;
}
return 0;
}
return 1;
}
}
int cnt;
int findc(int x, int p) {
int num = 1;
bool can = 1;
for (auto i : G[x]) {
if (i == p) continue;
int child = findc(i, x);
if (child > n/2) can = 0;
num += child;
}
if (n - num > n/2) can = 0;
if (can) cnt = x;
return num;
}
vector<int>arr;
void dis(int x, int p, int d) {
maxx += d*2;
arr.push_back(x);
for (auto i : G[x]) {
if (i == p) continue;
dis(i, x, d+1);
}
}
signed main() {
cin >> n;
G.resize(n); minans.resize(n); maxans.resize(n);
int a, b;
for (int i = 0 ; i < n-1 ; i++){
cin >> a >> b; a--, b--;
G[a].push_back(b);
G[b].push_back(a);
}
dfs(0, -1);
findc(0, -1);
dis(cnt, -1, 0);
for (int i = 0 ; i < n ; i++) {
//cout << arr[i] <<" ";
maxans[arr[i]] = arr[(i+n/2)%n];
}
//cout <<"\n";
assert(minn == ((n+1) / 2) * 2);
cout << minn << " " << maxx << "\n";
for (auto i : minans) cout << i+1 << " "; cout << "\n";
for (auto i : maxans) cout << i+1 << " "; cout << "\n";
}
Compilation message
Village.cpp: In function 'bool dfs(long long int, long long int)':
Village.cpp:21:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
21 | for (int i = 0 ; i < c.size()/2 ; i++) {
| ~~^~~~~~~~~~~~
Village.cpp: In function 'int main()':
Village.cpp:94:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
94 | for (auto i : minans) cout << i+1 << " "; cout << "\n";
| ^~~
Village.cpp:94:44: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
94 | for (auto i : minans) cout << i+1 << " "; cout << "\n";
| ^~~~
Village.cpp:95:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
95 | for (auto i : maxans) cout << i+1 << " "; cout << "\n";
| ^~~
Village.cpp:95:44: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
95 | for (auto i : maxans) cout << i+1 << " "; cout << "\n";
| ^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
0 ms |
348 KB |
Output is correct |
| 5 |
Correct |
0 ms |
344 KB |
Output is correct |
| 6 |
Correct |
0 ms |
348 KB |
Output is correct |
| 7 |
Runtime error |
0 ms |
348 KB |
Execution killed with signal 6 |
| 8 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1 ms |
600 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
0 ms |
348 KB |
Output is correct |
| 5 |
Correct |
0 ms |
344 KB |
Output is correct |
| 6 |
Correct |
0 ms |
348 KB |
Output is correct |
| 7 |
Runtime error |
0 ms |
348 KB |
Execution killed with signal 6 |
| 8 |
Halted |
0 ms |
0 KB |
- |
