제출 #1038856

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1038856		fv3	참나무 (IOI23_beechtree)	C++17	0 / 100	69 ms	17604 KiB

beechtree

#include <bits/stdc++.h>
#include "beechtree.h"

using namespace std;

vector<int> beechtree(int N, int M, vector<int> P, vector<int> C)
{
    vector<int> b(N);
    vector<vector<int>> adj(N);

    for (int i = 1; i < N; i++)
    {
        adj[P[i]].push_back(i);
    }

    map<int, int> colourCnt;
    for (auto node : adj[0])
    {
        b[node] = 1;
        set<int> childColours;
        for (auto e : adj[node])
        {
            if (childColours.count(C[e])) 
                b[node] = 0;
            childColours.insert(C[e]);
            colourCnt[C[e]]++;
            b[e] = 1;
        }
    }

    b[0] = 1;
    set<int> childColours;
    for (auto node : adj[0])
    {
        if (!b[node] || childColours.count(C[node]))
        {
            b[0] = 0;
            break;
        } 
        childColours.insert(C[node]);
    }

    vector<int> cnts;
    for (auto n : colourCnt)
    {
        if (childColours.count(n.first) == 0)
        {
            b[0] = 0;
            break;
        }
        cnts.push_back(n.second);
    }

    sort(cnts.begin(), cnts.end());
    for (int i = 0; i < cnts.size(); i++)
    {
        if (cnts[i] != i+1)
        {
            b[0] = 0;
            break;
        }
    }

    return b;
}

컴파일 시 표준 에러 (stderr) 메시지

beechtree.cpp: In function 'std::vector<int> beechtree(int, int, std::vector<int>, std::vector<int>)':
beechtree.cpp:55:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |     for (int i = 0; i < cnts.size(); i++)
      |                     ~~^~~~~~~~~~~~~

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