Submission #951755

#	Time	Username	Problem	Language	Result	Execution time	Memory
951755		vjudge1	Magic Tree (CEOI19_magictree)	C++17	0 / 100	242 ms	142416 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, p = 0;
	node *l = nullptr, *r = nullptr;
	node(){}
};


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

void push(node *v){
	if(!v -> l) v -> l = new node();
	v -> l -> x += v -> p;
	v -> l -> p += v -> p;
	
	if(!v -> r) v -> r = new node();
	v -> r -> x += v -> p;
	v -> r -> p += v -> p;

	v -> p = 0;
}


void upd(node *v, int l, int r, int L, int R, int x){
	if(r < L or R < l){
		return;
	}	
	if(L <= l and r <= R){
		v -> x += x;
		v -> p += x;
		return;
	}
	push(v);
	int mid=(l+r)/2;
	upd(v -> l, l, mid, L, R, x);
	upd(v -> r, mid + 1, r, L, R, x);
	v -> x = max((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;
	}
	push(v);
	int mid=(l+r)/2;
	ll sum = 0;
	if(v -> l){
		sum = max(sum, get(v -> l, l, mid, L, R));
	}
	if(v -> r){
		sum = max(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].begin();
	d[v] = new node(); 
	for(auto to: q[v]){
		dfs(to);
		if(h[to].size() > h[v].size()){
			swap(h[to], h[v]);
			swap(d[v], d[to]);
		}
		auto ls = k;
		for(auto dd = h[to].begin(); dd != h[to].end(); dd ++){
			h[v].insert(*dd);
			auto c = dd;
			c++;
			int g;
			if(c == h[to].end()){
				g = k;
			}
			else{
				 g = c -> ff - 1;
			}
			
			upd(d[v], 1, k, dd -> ff, g, get(d[to], 1, k, 1, dd -> ff));	
		}                 
		//dp[v][0] += max(dp[to][0], dp[to][1]);
	}
	
	upd(d[v], 1, k, g.ff, g.ff, g.ss);
	if(g.ff != -1){
		//dp[v][1] = get(d[v], 1, k, 1, g.ff);
		
	}
	//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].insert({l, r});
	}
	dfs(1);         
	cout<<get(d[1], 1, k, 1, k);
}


signed main(){
	solve();
}

Compilation message (stderr)

magictree.cpp: In function 'void dfs(long long int)':
magictree.cpp:83:8: warning: unused variable 'ls' [-Wunused-variable]
   83 |   auto ls = k;
      |        ^~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 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