제출 #1067129

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1067129		ZanP	참나무 (IOI23_beechtree)	C++17	0 / 100	2067 ms	29380 KiB

beechtree

#include "beechtree.h"
#include <iostream>
#include <vector>
#include <algorithm>
#include <unordered_map>
using namespace std;
#define ll long long

int n, m;
vector<int> parents, colors;
vector<vector<int>> children;

void dfs_subtree(int u, vector<int> & subtree)
{
    subtree.push_back(u);
    for(int v : children[u]){
        dfs_subtree(v, subtree);
    }
}

vector<int> get_subtree(int u)
{
    vector<int> subtree;
    subtree.reserve(n);
    dfs_subtree(u, subtree);
    return subtree;
}

bool check_permutation(int u, vector<int> & v){
    if(v[0] != u) return false;
    unordered_map<int, int> f;
    for (int i = 1; i < v.size(); i++)
    {
        if(!f.count(colors[i])) f[colors[i]] = 0;
        if(parents[v[i]] != v[f[colors[i]]]) return false;
        f[colors[i]]++;
    }
    return true;
}

vector<int> beechtree(int N, int M, vector<int> P, vector<int> C){
    n = N; m = M; parents = P; colors = C;  
    children.resize(N);
    vector<int> ans;
    ans.resize(N,0);
    for(int child = 1; child < N; child++)
    {
        children[P[child]].push_back(child);
    }

    // brute force
    vector<int> subtree;
    for(int u = 0; u<n; u++)
    {
        subtree = get_subtree(u);
        sort(subtree.begin(), subtree.end());
        if(check_permutation(u, subtree)){
            ans[u] = 1;
            continue;
        }
        while(next_permutation(subtree.begin(), subtree.end())){
            if(check_permutation(u, subtree)){
            ans[u] = 1;
            break;
            }
        }
    }

    return ans;
}

// int main()
// {
//     vector<int> ans = beechtree(4, 2, {-1, 0, 0, 0}, {0, 1, 1, 2});
//     for (int i = 0; i<ans.size(); i++)
//     {
//         cout << ans[i] << " ";
//     }
//     cout << "\n";
//     return 0;
// }

컴파일 시 표준 에러 (stderr) 메시지

beechtree.cpp: In function 'bool check_permutation(int, std::vector<int>&)':
beechtree.cpp:32:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for (int i = 1; i < 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