Submission #951730

#	Time	Username	Problem	Language	Result	Execution time	Memory
951730		vjudge1	Magic Tree (CEOI19_magictree)	C++17	3 / 100	249 ms	114088 KiB

magictree

#include<bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
#define pb push_back
#define ff first
#define ss second
#define ll long long
#define int ll

struct node{
	ll x = 0;
	node *l = nullptr, *r = nullptr;
	node(){}
};


vector<int> q[200100];
vector<pii> h[200100];
int n, m, k;
node *d[200100];
int dp[200100][2];


void upd(node *v, int l, int r, int pos, int x){
	if(l == r){
		v -> x += x;
		return;
	}
	int mid=(l + r) / 2;
	if(mid >= pos){
		if(!v -> l) v -> l = new node();
		upd(v -> l, l, mid, pos, x);
	}
	else{                               
		if(!v -> r) v -> r = new node();
		upd(v -> r, mid+1, r, pos, x);
	}
	v -> x = (v -> l ?v -> l -> x :0) + (v -> r ?v -> r -> x :0);
}

ll get(node *v, int l, int r, int L, int R){
	if(r < L or R < l){
		return 0;
	}
	if(L <= l and r <= R){
		return v -> x;
	}
	int mid=(l+r)/2;
	ll sum = 0;
	if(v -> l){
		sum += get(v -> l, l, mid, L, R);
	}
	if(v -> r){
		sum += get(v->r, mid+1, r, L, R);
	}
	return sum;

}


void dfs(int v){
	pii g={-1, -1};
	if(h[v].size()) g = h[v][0];
	d[v] = new node();
	upd(d[v], 1, k, g.ff, g.ss);
	for(auto to: q[v]){
		dfs(to);
		if(h[to].size() > h[v].size()){
			swap(h[to], h[v]);
			swap(d[v], d[to]);
		}
		for(auto dd: h[to]){
			upd(d[v], 1, k, dd.ff, dd.ss);	
		} 
		dp[v][0] += max(dp[to][0], dp[to][1]);
	}                     
	if(g.ff != -1){
		dp[v][1] = get(d[v], 1, k, 1, g.ff);
	}
	else{
		dp[v][1] = 0;
	}
	//cout<<v<<' '<<dp[v][0]<<' '<<dp[v][1]<<'\n';
}


void solve(){    
	cin>>n>>m>>k;
	for(int i=2; i<=n; i++){
		int x;
		cin>>x;
		q[x].pb(i);
	}
	for(int i=1; i<=m; i++){
		int v, l, r;
		cin>>v>>l>>r;
		//dp[v][0] = 1;
		h[v].pb({l, r});
	}
	dfs(1);         
	cout<<max(dp[1][0], dp[1][1]);
}


signed main(){
	solve();
}

• Subtask 1: 0 / 6
• Subtask 2: 3 / 3
• Subtask 3: 0 / 11
• Subtask 4: 0 / 12
• Subtask 5: 0 / 16
• Subtask 6: 0 / 13
• Subtask 7: 0 / 22
• Subtask 8: 0 / 17