Submission #849038

#	Time	Username	Problem	Language	Result	Execution time	Memory
849038		math_rabbit_1028	Beech Tree (IOI23_beechtree)	C++17	0 / 100	2058 ms	74432 KiB

beechtree

#include "beechtree.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
int n, m;
vector<int> p, c;
vector<int> adj[202020], res;
int sz[202020];
 
void getsz(int v) {
    sz[v] = 1;
    vector<pii> temp;
    for (int i = 0; i < adj[v].size(); i++) {
        int u = adj[v][i];
        getsz(u);
        sz[v] += sz[u];
        temp.push_back({sz[u], i});
    }
    if (temp.size() == 0) return;
    sort(temp.begin(), temp.end(), greater<pii>());
    swap(adj[v][temp[0].second], adj[v][0]);
}

vector< pair<pii, int> > merge(vector< pair<pii, int> > lge, vector< pair<pii, int> > sml) {
    int r = sml.begin()->second;
    vector< pair<pii, int> > res;
    priority_queue< pair<pii, int> > pq;
    pq.push({{sz[r], 0}, r});

    while (!pq.empty()) {
        int now = pq.top().second;
        int pos = upper_bound(lge.begin(), lge.end(), pq.top()) - lge.begin();
        // lge[pos - 1] <= now < lge[pos]
        res.push_back(pq.top());
        pq.pop();

        for (int j = 0; j < adj[now].size(); j++) {
            int u = adj[now][j];
            pq.push({{sz[u], -pos}, u});
        }
    }
    for (int i = 0; i < res.size(); i++) lge.push_back(res[i]);
    sort(lge.begin(), lge.end(), greater< pair<pii, int> >());
    return lge;
}

vector< pair<pii, int> > solve(int v) {
    vector< pair<pii, int> > vec;
    vec.push_back({{sz[v], 0}, v});
    for (int i = 0; i < adj[v].size(); i++) {
        int u = adj[v][i];
        if (i == 0) {
            vec = solve(u);
            vec.insert(vec.begin(), {{sz[v], 0}, v});
        }
        else vec = merge(vec, solve(u));
    }

    map<int, int> cnt;
    for (int i = 1; i < sz[v]; i++) {
        int now = vec[i].second, par; 
        if (cnt.find(c[now]) == cnt.end()) {
            par = vec[0].second;
            cnt.insert({c[now], 1});
        }
        else {
            par = vec[cnt[c[now]]].second;
            cnt[c[now]]++;
        }
 
        if (par != p[now]) {
            res[v] = 0;
        }
    }

    /*
    cout << "v : " << v << "\n";
    for (int i = 0; i < vec.size(); i++) cout << vec[i].second << " ";
    cout << "\n";
    */

    return vec;
}
 
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]].push_back(i);
    }
 
    for (int i = 0; i < n; i++) res.push_back(1);
    
    getsz(0);
    solve(0);
 
    return res;
}

Compilation message (stderr)

beechtree.cpp: In function 'void getsz(int)':
beechtree.cpp:16:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for (int i = 0; i < adj[v].size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~
beechtree.cpp: In function 'std::vector<std::pair<std::pair<int, int>, int> > merge(std::vector<std::pair<std::pair<int, int>, int> >, std::vector<std::pair<std::pair<int, int>, int> >)':
beechtree.cpp:40:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         for (int j = 0; j < adj[now].size(); j++) {
      |                         ~~^~~~~~~~~~~~~~~~~
beechtree.cpp:45:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::pair<int, int>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |     for (int i = 0; i < res.size(); i++) lge.push_back(res[i]);
      |                     ~~^~~~~~~~~~~~
beechtree.cpp: In function 'std::vector<std::pair<std::pair<int, int>, int> > solve(int)':
beechtree.cpp:53:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |     for (int i = 0; i < adj[v].size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~

• 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