Submission #1242653

#	Time	Username	Problem	Language	Result	Execution time	Memory
1242653		bangan	참나무 (IOI23_beechtree)	C++20	0 / 100	2099 ms	80408 KiB

beechtree

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

#define pb push_back
#define ALL(a) a.begin(), a.end()

const int MXN = 200200;

int n;
int m;
vector<int> p;
vector<int> c;
vector<int> adj[MXN];
bool leaf[MXN];

int h[MXN];
int sz[MXN];
vector<int> sub[MXN];

bool cmp(int v, int u) {
    if (h[v]!=h[u]) return h[v]<h[u];
    else return sz[v]>sz[u];
}

bool is_subset(vector<int> a, vector<int> b) {
    set<int> all;
    for (int x : b) all.insert(c[x]);
    for (int x : a) if (!all.contains(c[x])) return false;
    return true;
}

vector<int> ans;
void dfs(int v) {
    sz[v] = 1;
    if (leaf[v]) {
        ans[v] = 1;
        return;
    } 

    vector<int> norm, esp;
    for (int u : adj[v]) {
        h[u] = h[v]+1;
        dfs(u);
        sz[v] += sz[u];
        for (int x : sub[u]) (leaf[x] ? esp : norm).pb(x);
        (leaf[u] ? esp : norm).pb(u);
    }
    
    ans[v] = 1;
    sort(ALL(norm), cmp);
    for (int i=0; i+1 < norm.size(); i++) if (!is_subset(sub[norm[i+1]], sub[norm[i]])) ans[v] = 0;
    
    vector<int> kids;
    for (int u : adj[v]) kids.pb(u);
    if (!norm.empty()) if (!is_subset(sub[norm[0]], kids)) ans[v] = 0;

    sort(ALL(kids), [&](int x, int y) {
        return c[x] < c[y];
    });
    for (int i=0; i+1 < kids.size(); i++) if (c[kids[i]] != c[kids[i+1]]) ans[v] = 0;

    for (int x : norm) sub[v].pb(x);
    for (int x : esp) sub[v].pb(x);
}

vector<int> beechtree(int N, int M, vector<int> P, vector<int> C) {
    n = N;
    m = M;
    p = P;
    c = C;
    for (int i=1; i<n; i++) adj[p[i]].pb(i);
    for (int i=0; i<n; i++) leaf[i] = adj[i].empty();

    ans.resize(n);
    dfs(0);
    return ans;
}

• Subtask 0: 0 / 0
• Subtask 1: 0 / 9
• Subtask 2: 0 / 5
• Subtask 3: 0 / 9
• Subtask 4: 0 / 8
• Subtask 5: 0 / 14
• Subtask 6: 0 / 14
• Subtask 7: 0 / 12
• Subtask 8: 0 / 17
• Subtask 9: 0 / 12