Submission #1033048

#	Time	Username	Problem	Language	Result	Execution time	Memory
1033048		vjudge1	Village (BOI20_village)	C++17	100 / 100	47 ms	23744 KiB

Village

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define ll long long
#define ar array
#define ld long double

const int N = 3e5 + 20;
const int K = 200;
const int INF = 1e15;
const int LOG = 24;
const int MOD = 998244353;

vector<int> g[N], ord;
int n, posLo[N], posHi[N], ansLo, ansHi, sz[N];

void dfs(int x,int p){
	//cout<<x<<endl;
	sz[x] = 1;
	ord.push_back(x);
	for(auto u: g[x]){
		if(u == p)continue;
		dfs(u, x);
		sz[x] += sz[u];
		ansHi += min(sz[u], n - sz[u]);
	}
	if(posLo[x] == x){
		if(p == -1)swap(posLo[x], posLo[g[x][0]]);
		else swap(posLo[x], posLo[p]);
		ansLo += 2;
	}
	
}

signed main(){ios_base::sync_with_stdio(false);cin.tie(0);
	cin>>n;
	for(int i = 1;i < n;i++){
		int u, v;
		cin>>u>>v;
		--u, --v;
		g[u].push_back(v);
		g[v].push_back(u);
	}
	
	for(int i = 0;i < n;i++)posLo[i] = i;
	dfs(0, -1);
	ansHi *= 2;
	for(int i = 0;i < n;i++){
		//cout<<i<<endl;
		int u = ord[i];
		int v = ord[(i + n / 2 ) % n];
		posHi[u] = v;
	}
	//assert(0);
	cout<<ansLo<<" "<<ansHi<<'\n';
	for(int i = 0;i < n;i++)cout<<posLo[i] + 1<<" ";
	cout<<'\n';
	for(int i = 0;i < n;i++)cout<<posHi[i] + 1<<" ";
}

• Subtask 1: 12 / 12
• Subtask 2: 38 / 38
• Subtask 3: 50 / 50