Submission #851542

#	Time	Username	Problem	Language	Result	Execution time	Memory
851542		willychan	Passport (JOI23_passport)	C++14	0 / 100	3 ms	9820 KiB

passport

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
//#include<bits/extc++.h>
//__gnu_pbds

const int N = 2e5+5;
vector<int> side[N];
vector<int> rside[N];

int main(){
	ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	int n;cin>>n;		
	for(int i=1;i<=n;i++){
		int l,r;cin>>l>>r;	
		for(int j=l;j<=r;j++){
			side[j].push_back(i);
			rside[i].push_back(j);
		}
	}
	int dis1[n+1]={0};
	int disn[n+1]={0};
	dis1[1]=1;
	disn[n]=1;
	queue<int> q;
	q.push(1);
	while(q.size()){
		int a = q.front();
		q.pop();
		for(auto i : side[a]){
			if(dis1[i]) continue;
			dis1[i] = dis1[a]+1;
			q.push(i);
		}
	}
	queue<int> q2;
	q2.push(n);
	while(q2.size()){
		int a = q2.front();
		q2.pop();
		for(auto i : side[a]){
			if(disn[i]) continue;
			disn[i] = disn[a]+1;
			q2.push(i);
		}
	}
	int Q;cin>>Q;
	int rans[n+1] = {0};
	for(int i=1;i<=n;i++) {
		if(!dis1[i]) dis1[i] = 1e8;
		if(!disn[i]) disn[i] = 1e8;
		rans[i] = dis1[i]+disn[i];
	}
	while(Q--){
		int x;cin>>x;
		queue<int> qx;
		qx.push(x);
		vector<int> d(n+1,0);
		d[x]=1;
		while(qx.size()){
			int a = qx.front();
			qx.pop();
			for(auto i : rside[a]){
				if(d[i]) continue;
				d[i]= d[a]+1;
				qx.push(i);
			}
		}
		ll ans = 1e9;
		for(int i=1;i<=n;i++){
			if(d[i]==0) continue;
			ans=  min(ans,1LL*rans[i]+d[i]-3);
		}
		cout<<ans<<"\n";
	}
	return 0;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 8
• Subtask 5: 0 / 46