이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
// correct/subtask-shallow.cpp
#include "beechtree.h"
#include <set>
#include <algorithm>
using namespace std;
vector<int> beechtree(int N, int /*M*/, vector<int> P, vector<int> C)
{
vector<set<int>> ch_colors(N);
vector<int> t(N, true);
for (int v = 1; v < N; ++v)
{
int u = P[v], c = C[v];
if (ch_colors[u].count(c))
{
t[u] = false;
if (u > 0)
t[0] = false;
}
else
ch_colors[u].insert(c);
}
vector<int> ord(N);
for (int i = 0; i < N; ++i)
ord[i] = i;
sort(ord.begin(), ord.end(), [&](int u, int v)
{
if (ch_colors[u].size() != ch_colors[v].size())
return ch_colors[u].size() < ch_colors[v].size();
return u > v; });
if (ord[N - 1] != 0)
t[0] = false;
for (int i = 0; i + 1 < N; ++i)
{
int u = ord[i], v = ord[i + 1];
for (int c : ch_colors[u])
{
if (!ch_colors[v].count(c))
t[0] = false;
}
}
return t;
}
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