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Submission #1095787

# Submission time Handle Problem Language Result Execution time Memory
1095787 2024-10-03T07:29:47 Z alexander707070 Magic Tree (CEOI19_magictree) C++14
12 / 100
 119 ms 20820 KB 
#include<bits/stdc++.h>
#define MAXN 100007
using namespace std;

int n,m,k,p[MAXN],a,d,w,sz[MAXN],heavy[MAXN];
pair<int,int> cost[MAXN];
vector<int> v[MAXN];

struct event{
	int l,r;
	long long val;
};

struct ST{
	struct node{
		long long mins,maxs;
		long long setv,addv;

		inline friend node operator + (node fr,node sc){
			return {min(fr.mins,sc.mins),max(fr.maxs,sc.maxs),-1,0};
		}
	};

	node tree[4*MAXN];
	vector<event> w;

	void combine(node &v,long long s,bool type){
		if(!type){
			v.mins+=s; v.maxs+=s; v.addv+=s;
		}else{
			v.mins=v.maxs=s; v.setv=s; v.addv=0;
		}
	}

	void psh(int v){
		if(tree[v].setv!=-1){
			combine(tree[2*v],tree[v].setv,true);
			combine(tree[2*v+1],tree[v].setv,true);

			tree[v].setv=-1;
		}

		if(tree[v].addv!=0){
			combine(tree[2*v],tree[v].addv,false);
			combine(tree[2*v+1],tree[v].addv,false);

			tree[v].addv=0;
		}
	}

	void update(int v,int l,int r,int ll,int rr,long long s,bool type){
		if(ll>rr)return;
		if(l==ll and r==rr){
			combine(tree[v],s,type);
		}else{
			psh(v);
			int tt=(l+r)/2;
			update(2*v,l,tt,ll,min(tt,r),s,type);
			update(2*v+1,tt+1,r,max(tt+1,ll),rr,s,type);

			tree[v]=tree[2*v]+tree[2*v+1];
		}
	}

	long long getval(int v,int l,int r,int pos){
		if(l==r)return tree[v].mins;

		psh(v);
		int tt=(l+r)/2;
		if(pos<=tt)return getval(2*v,l,tt,pos);
		else return getval(2*v+1,tt+1,r,pos);
	}

	void dfs(int v,int l,int r){
		if(tree[v].mins==tree[v].maxs){
			if(w.empty() or w.back().val!=tree[v].mins){
				w.push_back({l,r,tree[v].mins});
			}else w.back().r=r;
		}else{
			int tt=(l+r)/2;
			psh(v);
			dfs(2*v,l,tt);
			dfs(2*v+1,tt+1,r);
		}
	}

	void init(){
		w.clear();
		update(1,1,k,1,k,0,true);
	}
}seg;

void dfs(int x){
	sz[x]=1;

	for(int i=0;i<v[x].size();i++){
		dfs(v[x][i]);
		sz[x]+=sz[v[x][i]];
		if(sz[v[x][i]]>sz[heavy[x]])heavy[x]=v[x][i];
	}
}

void solve(int x){

	vector<event> s;
	for(int i=0;i<v[x].size();i++){
		if(v[x][i]==heavy[x])continue;
		solve(v[x][i]);

		seg.dfs(1,1,k);
		for(event curr:seg.w){
			s.push_back(curr);
		}

		seg.init();
	}

	if(heavy[x]!=0){
		solve(heavy[x]);
	}

	for(event curr:s){
		seg.update(1,1,k,curr.l,curr.r,curr.val,false);
	}

	if(cost[x].first==0)return;

	long long newval=seg.getval(1,1,k,cost[x].first)+cost[x].second;
	int l=cost[x].first,r=k+1,tt;

	while(l+1<r){
		tt=(l+r)/2;
		if(seg.getval(1,1,k,tt)<newval){
			l=tt;
		}else{
			r=tt;
		}
	}

	seg.update(1,1,k,cost[x].first,l,newval,true);
	return;
}

int main(){

	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	cin>>n>>m>>k;
	for(int i=2;i<=n;i++){
		cin>>p[i];
		v[p[i]].push_back(i);
	}

	dfs(1);

	for(int i=1;i<=m;i++){
		cin>>a>>d>>w;
		cost[a]={d,w};
	}

	solve(1);
	cout<<seg.tree[1].maxs<<"\n";

    return 0;
}

Compilation message

magictree.cpp: In function 'void dfs(int)':
magictree.cpp:96:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   96 |  for(int i=0;i<v[x].size();i++){
      |              ~^~~~~~~~~~~~
magictree.cpp: In function 'void solve(int)':
magictree.cpp:106:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  106 |  for(int i=0;i<v[x].size();i++){
      |              ~^~~~~~~~~~~~

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Incorrect 2 ms 2652 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 3.0

# Verdict Execution time Memory Grader output
1 Incorrect 119 ms 16024 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2908 KB Output is correct
2 Incorrect 2 ms 2908 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 42 ms 8272 KB Output is correct
2 Correct 40 ms 8532 KB Output is correct
3 Correct 39 ms 13904 KB Output is correct
4 Correct 29 ms 10584 KB Output is correct
5 Correct 37 ms 20820 KB Output is correct

Subtask #5
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Incorrect 2 ms 2652 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 11 ms 7516 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Incorrect 2 ms 2652 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #8
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2652 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Incorrect 2 ms 2652 KB Output isn't correct
4 Halted 0 ms 0 KB -