oj.uz

답안 #713281

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
713281 2023-03-21T15:45:51 Z amirhoseinfar1385 Birthday gift (IZhO18_treearray) C++17
0 / 100
 20 ms 29844 KB 
#include<bits/stdc++.h>
using namespace std;
int n,m,q;
const int maxn=200000+10;
vector<int>adj[maxn];
int timea=0;
pair<int,int>stf[maxn];
int lca[19][maxn];
 
void dfs(int u,int par=0){
	timea++;
	stf[u].first=timea;
	lca[0][u]=par;
	for(auto x:adj[u]){
		if(x==par){
			continue;
		}
		dfs(x,u);
	}
	stf[u].second=timea;
}
 
void callca(){
	for(int i=1;i<19;i++){
		for(int j=1;j<=n;j++){
			lca[i][j]=lca[i-1][lca[i-1][j]];
		}
	}
}
 
bool zird(int u,int v){
	if(stf[v].first<=stf[u].first&&stf[v].second>=stf[u].second){
		return 1;
	}
	return 0;
}
 
int getlca(int u,int v){
	if(zird(u,v)){
		return v;
	}
	if(zird(v,u)){
		return u;
	}
	for(int i=18;i>=0;i--){
		if(lca[i][u]!=0&&!zird(v,lca[i][u])){
			u=lca[i][u];
		}
	}
	u=lca[0][u];
	return u;
}
int kaf=(1<<18);
struct segment{
	map<int,int>seg[(1<<19)];
	void upd(int i,int v,int wher){
		if(i==0){
			return ;
		}
		if((i<<1)>=(1<<19)){
			seg[i][v]=wher;
			return upd((i>>1),v,wher);
		}
		if(seg[(i<<1)].count(v)==0){
			seg[i][v]=seg[(i<<1)^1][v];
		}
		else if(seg[(i<<1)^1].count(v)==0){
			seg[i][v]=seg[(i<<1)][v];
		}
		else{
			seg[i][v]=min(seg[(i<<1)][v],seg[(i<<1)^1][v]);
		}
		return upd((i>>1),v,wher);
	}
	int pors(int i,int l,int r,int tl,int tr,int v){
		if(l>r||l>tr||r<tl||seg[i].count(v)==0){
			return m+2;
		}
		if(l>=tl&&r<=tr){
			return seg[i][v];
		}
		int ma=(l+r)>>1;
		int ret=pors((i<<1),l,ma,tl,tr,v);
		if(ret==m+2){
			ret=pors((i<<1)^1,ma+1,r,tl,tr,v);
		}
		return ret;
	}
}seg;
 
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>m>>q;
	for(int i=0;i<n-1;i++){
		int u,v;
		cin>>u>>v;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	dfs(1);
	callca();
	vector<int>allm(m);
	for(int i=0;i<m;i++){
		cin>>allm[i];
	}
	for(int i=0;i<m;i++){
		seg.upd(kaf+i,allm[i],i);
		if(i!=m-1){
			seg.upd(kaf+i,getlca(allm[i],allm[i+1]),i);
		}
	}
	for(int i=0;i<q;i++){
		int qq;
		cin>>qq;
		if(qq==1){
			int ind,v;
			cin>>ind>>v;
			ind--;
			seg.upd(kaf+ind,allm[ind],m+2);
			if(ind!=m-1){
				seg.upd(kaf+ind,getlca(allm[ind],allm[ind+1]),m+2);
			}
			if(ind!=0){
				seg.upd(kaf+ind-1,getlca(allm[ind],allm[ind-1]),m+2);
			}
			allm[ind]=v;
			seg.upd(kaf+ind,allm[ind],ind);
			if(ind!=m-1){
				seg.upd(kaf+ind,getlca(allm[ind],allm[ind+1]),ind);
			}
			if(ind!=0){
				seg.upd(kaf+ind-1,getlca(allm[ind],allm[ind-1]),ind-1);
			}
		}
		else{
			int l,r,v;
			cin>>l>>r>>v;
			l--;
			r--;
			if(allm[r]==v){
				cout<<r+1<<" "<<r+1<<"\n";
				continue;
			}
			int w=seg.pors(1,0,kaf-1,l,r-1,v);
			if(w==m+2){
				cout<<-1<<" "<<-1<<"\n";
				continue;
			}
			if(allm[w]==v){
				cout<<w+1<<" "<<w+1<<"\n";
			}
			else{
				cout<<w+1<<" "<<w+1+1<<"\n";
			}
		}
	}
}

Subtask #1
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 29696 KB n=5
2 Correct 16 ms 29780 KB n=100
3 Correct 17 ms 29844 KB n=100
4 Correct 20 ms 29764 KB n=100
5 Incorrect 17 ms 29780 KB Jury has the answer but participant has not
6 Halted 0 ms 0 KB -

Subtask #2
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 29696 KB n=5
2 Correct 16 ms 29780 KB n=100
3 Correct 17 ms 29844 KB n=100
4 Correct 20 ms 29764 KB n=100
5 Incorrect 17 ms 29780 KB Jury has the answer but participant has not
6 Halted 0 ms 0 KB -

Subtask #3
0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 29696 KB n=5
2 Correct 16 ms 29780 KB n=100
3 Correct 17 ms 29844 KB n=100
4 Correct 20 ms 29764 KB n=100
5 Incorrect 17 ms 29780 KB Jury has the answer but participant has not
6 Halted 0 ms 0 KB -

Subtask #4
0 / 44.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 29696 KB n=5
2 Correct 16 ms 29780 KB n=100
3 Correct 17 ms 29844 KB n=100
4 Correct 20 ms 29764 KB n=100
5 Incorrect 17 ms 29780 KB Jury has the answer but participant has not
6 Halted 0 ms 0 KB -