Submission #1125529

#	Time	Username	Problem	Language	Result	Execution time	Memory
1125529		Agageldi	Ball Machine (BOI13_ballmachine)	C++20	4.84 / 100	200 ms	114760 KiB

ballmachine

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

#define ll long long
#define N 4000005
#define ff first
#define ss second
#define pb push_back
#define sz(s) (int)s.size()
#define rep(c, a, b) for(c = a; c <= b; c++)

int n, t, q, m = 1, vis[N], par[N], r, dis[N];
vector <int> v[N];
set <int> ans, jog;

void solve(int x) {
	vector <pair<int,int>> s;

	for(auto i : v[x]) s.pb({dis[i],i});
	sort(s.begin(),s.end());
	for(auto i:s) solve(i.ss);
	vis[m] = x;
	ans.insert(m);
	m++;
}
void dfs(int x) {
	for(auto i:v[x]) {
		dfs(i);
		dis[x] = min(dis[x],dis[i]);
	}
	dis[x] = min(x,dis[x]);
}

int main () {
	ios::sync_with_stdio(0);cin.tie(0);
	cin >> n >> q;
	for(int i = 0;i<=n;i++) {
		dis[i] = INT_MAX;
	}
	for(int i = 1; i <= n; i++) {
		int x;
		cin >> x;
		if(x) {
			v[x].pb(i);
			par[i] = x;
		}
		else r = i;
	}
	dfs(r);
	solve(r);
	par[r] = r;
	for(int i = 1; i <= q; i++) {
		int x;
		cin >> t >> x;
		if(t == 1) {
			for(int j = 1; j <= x; j++) {
				jog.insert(*ans.begin());
				ans.erase(*ans.begin());
			}
			cout << vis[*(--jog.end())] << '\n';
			continue;
		}
		ans.insert(vis[x]);
		jog.erase(vis[x]);
		cout << '0' << '\n';
	}
}

• Subtask 1: 0 / 25
• Subtask 2: 4.2857 / 30
• Subtask 3: 0 / 40
• Subtask 4: 0.5556 / 5