Submission #644864

#	Time	Username	Problem	Language	Result	Execution time	Memory
644864		Do_you_copy	Drawing (CEOI22_drawing)	C++17	100 / 100	284 ms	38264 KiB

Main

////////////////////////////
// Gke vay sao            //
////////////////////////////
#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;
using ll = long long;
using ull = unsigned ll;
using ld = long double;
using pii = pair <int, int>;
using pil = pair <int, ll>;
using pli = pair <ll, int>;
using pll = pair <ll, ll>;
mt19937 Rand(chrono::steady_clock::now().time_since_epoch().count());

ll min(const ll &a, const ll &b){
    return (a < b) ? a : b;
}

ll max(const ll &a, const ll &b){
    return (a > b) ? a : b;
}

//const ll Mod = 1000000007;
//const ll Mod2 = 999999999989;
//only use when required
const int maxN = 3e5 + 1;
int n;

struct TPoint{
    int x, y, idx;
};

TPoint p[maxN];
vector <int> adj[maxN];
int sz[maxN];
int ans[maxN];
int x, y;

void pre_dfs(int u, int par){
    sz[u] = 1;
    for (int i: adj[u]){
        if (i == par) continue;
        pre_dfs(i, u);
        sz[u] += sz[i];
    }
}

void dfs(int u, int par, int idx){
    ans[p[idx].idx] = u;
    int tem = idx + 1;
    for (int i: adj[u]){
        if (i == par) continue;
        dfs(i, u, tem);
        tem += sz[i];
    }
}

void Init(){
    cin >> n;
    for (int i = 1; i < n; ++i){
        int u, v; cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    pre_dfs(1, 0);
    for (int i = 1; i <= n; ++i){
        cin >> p[i].x >> p[i].y;
        p[i].idx = i;
    }
    if (n == 1){
        cout << 1; return;
    }
    sort(p + 1, p + n + 1,[](const auto &i, const auto &j){
        //left bottom
        if (i.x == j.x) return i.y < j.y;
        return i.x < j.x;
    });
    x = p[1].x;
    y = p[1].y;
    sort(p + 2, p + n + 1,[&](const auto &i, const auto &j){
        //cross product
        return x * i.y - i.x * y > x * j.y - j.x * y;
    });
    dfs(1, 0, 1);
    for (int i = 1; i <= n; ++i) cout << ans[i] << " ";
}

#define debu
#define taskname "test"
signed main(){
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        #ifdef debug
        freopen(taskname".out", "w", stdout);
        #endif
    }
    faster;
    ll tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    #ifdef debug
        ofstream timeout("timeout.txt");
        timeout << signed(1000 * double(clock()) / CLOCKS_PER_SEC);
        timeout.close();
    #else
        cerr << "\nTime elapsed: " << 1000 * double(clock()) / CLOCKS_PER_SEC << "ms\n";
    #endif
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:97:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   97 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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