Submission #781116

#	Time	Username	Problem	Language	Result	Execution time	Memory
781116		mnbvcxz123	Village (BOI20_village)	C++17	0 / 100	1 ms	340 KiB

Village

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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n;
    cin>>n;
    vector<vector<int>>g(n);
    for(int i=1,u,v;i<n;++i){
        cin>>u>>v;
        --u,--v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    vector<int>ord,sz(n);
    ll cnt=0;
    function<void(int,int)>dfs=[&](int u, int p){
        sz[u]=1;
        ord.push_back(u);
        for(const int&i:g[u])
            if(i!=p){
                dfs(i,u);
                sz[u]+=sz[i];
                cnt+=min(sz[i],n-sz[i]);
            }
    };
    dfs(0,0);
    vector<int>ans(n);
    for(int i=0;i<n;++i){
        int u=ord[i];
        int v=ord[(i+n/2)%n];
        ans[v]=u;
    }
    cout<<2*cnt<<'\n';
    for(int i=0;i<n;++i)cout<<ans[i]+1<<' ';
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 38
• Subtask 3: 0 / 50