제출 #1039042

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1039042		Zicrus	참나무 (IOI23_beechtree)	C++17	9 / 100	86 ms	20960 KiB

beechtree

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

typedef long long ll;

vector<int> beechtree(int n, int m, vector<int> p, vector<int> c) {
    vector<int> res(n, 1);
    vector<vector<ll>> adj(n);
    for (int i = 1; i < n; i++) {
        adj[p[i]].push_back(i);
    }
    vector<pair<ll, ll>> szId(n);
    for (int i = 0; i < n; i++) {
        szId[i] = {adj[i].size(), i};
    }
    sort(szId.begin(), szId.end());
    unordered_set<ll> used;
    if (adj[0].size() != szId.back().first) res[0] = 0;
    for (auto &e : adj[0]) {
        if (used.count(c[e]))
            res[0] = 0;
        used.insert(c[e]);
    }
    for (int i = n-1; i >= 1; i--) {
        unordered_set<ll> nw;
        for (auto &e : adj[szId[i].second]) {
            if (!used.count(c[e]))
                res[0] = 0;
            if (nw.count(c[e]))
                res[szId[i].second] = res[0] = 0;
            nw.insert(c[e]);
        }
        used = nw;
    }
    return res;
}

컴파일 시 표준 에러 (stderr) 메시지

beechtree.cpp: In function 'std::vector<int> beechtree(int, int, std::vector<int>, std::vector<int>)':
beechtree.cpp:19:23: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   19 |     if (adj[0].size() != szId.back().first) res[0] = 0;
      |         ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~

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