Submission #862074

#	Time	Username	Problem	Language	Result	Execution time	Memory
862074		vgtcross	Drawing (CEOI22_drawing)	C++17	100 / 100	195 ms	52672 KiB

Main

#include <bits/stdc++.h>

#define X real()
#define Y imag()

using namespace std;

using ll = long long;
using P = complex<ll>;

const int N = 200200;

vector<int> adj[N];
vector<int> ord;
pair<P, int> pt[N];

bool cmp1(P a, P b) {
    if (a.X != b.X) return a.X < b.X;
    else return a.Y < b.Y;
}

bool cmp2(pair<P, int> a, pair<P, int> b) {
    return (conj(b.first - a.first) * (a.first - pt[0].first)).Y > 0;
}

void dfs(int u, int p) {
    vector<int> ch;
    for (int v : adj[u]) if (v != p) ch.push_back(v);
    if (ch.size() == 0) ord.push_back(u);
    else if (ch.size() == 1) {
        ord.push_back(u);
        dfs(ch[0], u);
    } else {
        dfs(ch[0], u);
        ord.push_back(u);
        dfs(ch[1], u);
    }
}

void solve() {
    int n;
    cin >> n;
    
    for (int i = 1; i < n; ++i) {
        int u, v;
        cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    
    int r = 1;
    while (adj[r].size() > 1) ++r;
    dfs(r, -1);
    
    for (int i = 0; i < n; ++i) {
        int x, y;
        cin >> x >> y;
        pt[i] = {{x, y}, i};
        if (cmp1(pt[i].first, pt[0].first)) swap(pt[i], pt[0]);
    }
    sort(pt+1, pt+n, cmp2);
    vector<int> ans(n);
    for (int i = 0; i < n; ++i) ans[pt[i].second] = ord[i];
    for (int i = 0; i < n; ++i) cout << ans[i] << " \n"[i == n-1];
}

int main() {
    cin.tie(0) -> sync_with_stdio(0);
    
    solve();
}

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