Submission #971429

#	Time	Username	Problem	Language	Result	Execution time	Memory
971429		LCJLY	Passport (JOI23_passport)	C++14	16 / 100	2 ms	1628 KiB

passport

#include <bits/stdc++.h>
using namespace std;
	
#define int long long 
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl;
#define show4(x,y) for(auto it:y) cout << it << " "; cout << #x << endl;
typedef pair<long long,long long>pii;
typedef pair<int,pii>pi2;
mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());

pii arr[305];
int n;
int memo[305][305];

inline pair<pii,pii> combine(pair<pii,pii> a, pair<pii,pii> b){
	pii temp=min(make_pair(a.first.first,-a.first.second),make_pair(b.first.first,-b.first.second));
	temp.second=-temp.second;
	pii temp2=max(make_pair(a.second.second,-a.second.first),make_pair(b.second.second,-b.second.first));
	temp2.second=-temp2.second;
	swap(temp2.first,temp2.second);
	return {temp,temp2};
}
 
struct node{	
	int s,e,m;
	node *l,*r;
	pair<pii,pii>v;
	
	node(int ss, int ee):s(ss),e(ee),m((s+e)>>1){
		v={{0,0},{0,0}};
		if(s!=e){
			l=new node(s,m);
			r=new node(m+1,e);
		}
	}
	
	void upd(int x, pii y){
		if(s==e){
			v={y,y};
			return;
		}
		if(x<=m) l->upd(x,y);
		else r->upd(x,y);
		v=combine(l->v,r->v); 
	}
	
	pair<pii,pii> query(int x, int y){
		if(x<=s&&y>=e){
			return v;
		}
		if(y<=m) return l->query(x,y);
		if(x>m) return r->query(x,y);
		return combine(l->query(x,m),r->query(m+1,y));
	}
};

node st(0,2505);

int dp(int l, int r){
	if(l==1&&r==n) return 0;
	if(memo[l][r]!=-1) return memo[l][r];
	int ans=1e15;
	//show2(l,l,r,r);
	pair<pii,pii>hold=st.query(l,r);
	//show2(hold.first.first,hold.first.first,hold.first.second,hold.first.second);
	//show2(hold.second.first,hold.second.first,hold.second.second,hold.second.second);
	if(hold.first.first<l){
		ans=min(ans,dp(hold.first.first,max(r,hold.first.second))+1);
	}
	if(hold.second.second>r){
		ans=min(ans,dp(min(l,hold.second.first),hold.second.second)+1);
	}
	return memo[l][r]=ans;
}

void solve(){
	cin >> n;
	for(int x=1;x<=n;x++){
		cin >> arr[x].first >> arr[x].second;
		st.upd(x,arr[x]);
	}
	
	int q;
	cin >> q;
	int temp;
	memset(memo,-1,sizeof(memo));
	for(int x=0;x<q;x++){
		cin >> temp;
		int hold=dp(arr[temp].first,arr[temp].second);
		if(hold>1e12){
			cout << -1 << "\n";
		}
		else cout << hold+1 << "\n";
	}
}
 
int32_t main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int t=1;
	//freopen("in.txt","r",stdin);
	//cin >> t;
	while(t--){
		solve();
	}
}

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