Submission #1189928

#	Time	Username	Problem	Language	Result	Execution time	Memory
1189928		Gray	Drawing (CEOI22_drawing)	C++20	100 / 100	137 ms	34404 KiB

Main

#include <bits/stdc++.h>
#include <cmath>
using namespace std;
#define ll int
#define ull unsigned long long
#define ld long double
#define ff first
#define ss second
#define ln "\n"
#define mp make_pair
#define pb push_back
#define INF (ll)1e18
ll MOD = (ll)(1e9+7);
ll n;
vector<array<ll, 3>> pts;
vector<vector<ll>> A;
vector<ll> sz;
void dfs(ll u, ll p){
    sz[u]=1;
    for (auto v:A[u]){
        if (v==p) continue;
        dfs(v, u); sz[u]+=sz[v];
    }
}

void gen(ll u, ll p, ll cx, ll cy, vector<array<ll, 3>> &avail, vector<ll> &res){
    ll cnt=0;
    for (auto v:A[u]){
        if (v==p) continue;
        cnt++;
    }
    if (false){
        sort(avail.begin(), avail.end(), [&](auto &op1, auto &op2){
            return atan2(op1[0]-cx, op1[1]-cy)<atan2(op2[0]-cx, op2[1]-cy);
        });
        vector<array<ll, 3>> push;
        for (auto v:A[u]){
            if (v==p) continue;
            push.clear();
            ll ax=avail.back()[0], ay=avail.back()[1];
            res[avail.back()[2]]=v; avail.pop_back();
            for (ll i=0; i<sz[v]-1; i++) {
                push.push_back(avail.back());
                avail.pop_back();
            }
            gen(v, u, ax, ay, push, res);
        }
    }else{
        for (auto v:A[u]){
            if (v==p) continue;
            ll ax=avail.back()[0], ay=avail.back()[1];
            res[avail.back()[2]]=v; avail.pop_back();
            gen(v, u, ax, ay, avail, res);
        }
    }
}

void solve(){
    cin >> n; pts.resize(n); A.resize(n+1);
    for (ll i=1; i<n; i++){
        ll u, v; cin >> u >> v;
        A[u].push_back(v); A[v].push_back(u);
    }
    sz.resize(n+1); dfs(1, 1);
    for (ll i=0; i<n; i++){
        cin >> pts[i][0] >> pts[i][1]; pts[i][2]=i;
    }
    sort(pts.begin(), pts.end(), [&](auto op1, auto op2){
        return op1[1]>op2[1];
    });
    vector<ll> res(n);
    res[pts[0][2]]=1;
    vector<array<ll, 3>> avail;
    for (ll i=1; i<n; i++) avail.push_back(pts[i]);
    gen(1, 1, pts[0][0], pts[0][1], avail, res);
    for (ll i=0; i<n; i++) cout << res[i] << " ";
    cout << ln;
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    #ifdef LOCAL
    auto start = chrono::high_resolution_clock::now();
    #endif
    ll testc=1;
    // cin >> testc;
    for (ll __c=1; __c<=testc; __c++) solve();
    #ifdef LOCAL
    auto duration = chrono::duration_cast<chrono::microseconds>(chrono::high_resolution_clock::now() - start);
    cout << setprecision(0) << fixed << "time: " << (double)duration.count()/1000.0 << " milliseconds" << endl;
    #endif
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 35 / 35
• Subtask 5: 25 / 25