# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1066711 | LittleOrange | Beech Tree (IOI23_beechtree) | C++17 | 2037 ms | 85796 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "beechtree.h"
#include<bits/stdc++.h>
using namespace std;
using ll = int;
struct obj{
ll i,d;
set<ll> s;
bool operator<(const obj &o){
return d!=o.d?d<o.d:s.size()>o.s.size();
}
bool nxt(const obj &o){
for(ll i : o.s){
if (!s.count(i)){
return false;
}
}
return true;
}
};
std::vector<int> beechtree(int N, int M, std::vector<int> P, std::vector<int> C)
{
ll n = N;
ll m = M;
vector<vector<ll>> ch(n);
for(ll i = 1;i<n;i++) ch[P[i]].push_back(i);
vector<ll> h(n,0),d(n,0);
{
function<void(ll)> dfs;
dfs = [&](ll i){
for(ll j : ch[i]) {
d[j] = d[i]+1;
dfs(j);
h[i] = max(h[i],h[j]+1);
}
};
dfs(0);
}
vector<ll> bad(n,0);
for(ll i = n-1;i>=0;i--){
vector<ll> v;
for(ll j : ch[i]){
if (bad[j]) bad[i] = 1;
v.push_back(C[j]);
if(ch[i].size()<ch[j].size()) bad[i] = 1;
}
sort(v.begin(),v.end());
if (unique(v.begin(),v.end())!=v.end()) bad[i] = 1;
}
vector<ll> ans(n,0);
for(ll i = 0;i<n;i++){
if (bad[i]) continue;
if (h[i]<=1) {
ans[i] = 1;
continue;
}
vector<obj> cur;
function<void(ll)> dfs;
dfs = [&](ll i){
if (ch[i].empty()) return;
obj o = {i,d[i]};
for(ll j : ch[i]){
o.s.insert(C[j]);
}
cur.push_back(o);
for(ll j : ch[i]){
dfs(j);
}
};
dfs(i);
sort(cur.begin(),cur.end());
ll res = 1;
for(ll i = 0;i+1<cur.size();i++){
if (!cur[i].nxt(cur[i+1])){
res = 0;
break;
}
}
ans[i] = res;
}
return ans;
}
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