Submission #239111

#TimeUsernameProblemLanguageResultExecution timeMemory
239111kshitij_sodaniBirthday gift (IZhO18_treearray)C++17
100 / 100
1439 ms75556 KiB
#include <bits/stdc++.h>
using namespace std;
typedef int64_t llo;
#define mp make_pair
#define pb push_back
#define a first 
#define b second

int n,m,q;
set<pair<int,int>> ac[200001];
vector<int> adj[200001];
int it[200001];
int tt[200001];
int par[200001][20];
int lev[200001];
void dfs(int no,int par2=-1,int levv=0){
	par[no][0]=par2;
	lev[no]=levv;
	for(auto j:adj[no]){
		if(j!=par2){
			dfs(j,no,levv+1);
		}
	}
}
int lca(int aa,int bb){
	if(lev[aa]>lev[bb]){
		swap(aa,bb);
	}
	int kk=lev[bb]-lev[aa];
	for(int j=19;j>=0;j--){
		if(kk&(1<<j)){
			bb=par[bb][j];
		}
	}
	if(aa==bb){
		return aa;
	}
	for(int j=19;j>=0;j--){
		if(par[aa][j]==par[bb][j]){
			continue;
		}
		aa=par[aa][j];
		bb=par[bb][j];
	}
	return par[aa][0];
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n>>m>>q;
	for(int i=0;i<n-1;i++){
		int aa,bb;
		cin>>aa>>bb;
		adj[aa-1].pb(bb-1);
		adj[bb-1].pb(aa-1);
	}
	for(int i=0;i<m;i++){
		cin>>it[i];
		it[i]--;
	}
	dfs(0);
	for(int j=1;j<20;j++){
		for(int i=0;i<n;i++){
			if(par[i][j-1]==-1){
				par[i][j]=-1;
			}
			else{
				par[i][j]=par[par[i][j-1]][j-1];
			}
		}
	}
	for(int i=0;i<m-1;i++){
		tt[i]=lca(it[i],it[i+1]);
		ac[tt[i]].insert({i,1});
	}
	for(int i=0;i<m;i++){
		ac[it[i]].insert({i,0});
	}
	for(int i=0;i<q;i++){
		int aa;
		cin>>aa;
		if(aa==2){
			int ind,l,r;
			cin>>l>>r>>ind;
			l--;
			r--;
			ind--;
			auto x=ac[ind].lower_bound({l,0});
			if(x!=ac[ind].end()){
				if((*x).b==0){
					if((*x).a<=r){
						cout<<(*x).a+1<<" "<<(*x).a+1<<endl;
						continue;
					}
				}
				else{
					if((*x).a+1<=r){
						cout<<(*x).a+1<<" "<<(*x).a+2<<endl;
						continue;
					}
				}
			}
			cout<<"-1 -1"<<endl;
		}
		else{
			int ind;
			int val;
			cin>>ind>>val;
			ind--;
			val--;
			ac[it[ind]].erase({ind,0});
			if(ind<m-1){
				ac[tt[ind]].erase({ind,1});
			}
			if(ind>0){
				ac[tt[ind-1]].erase({ind-1,1});
			}
			it[ind]=val;
			ac[it[ind]].insert({ind,0});
			if(ind<m-1){
				tt[ind]=lca(it[ind],it[ind+1]);
				ac[tt[ind]].insert({ind,1});
		//		cout<<tt[ind]<<endl;
			}
			if(ind>0){
				tt[ind-1]=lca(it[ind-1],it[ind]);
				ac[tt[ind-1]].insert({ind-1,1});
		//		cout<<tt[ind-1]<<endl;
			}
		}
	}







	return 0;
}
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