Submission #1222905

#	Time	Username	Problem	Language	Result	Execution time	Memory
1222905		ByeWorld	Passport (JOI23_passport)	C++20	0 / 100	12 ms	23876 KiB

passport

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
// #define int long long
#define ll long long
#define se second
#define fi first
#define pb push_back
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
using namespace std;
typedef pair<int,int> pii;
typedef pair<int,pii> ipii;
const int MAXN = 1e6+10;
const int SQRT = 450;
const int INF = 1e8;
const int MOD = 998244353;
const int LOG = 20;
int sum(int a, int b){ a%=MOD; b%=MOD; return (a+MOD+b)%MOD; }
void chsum(int &a, int b){ a%=MOD; b%=MOD; a = (a+MOD+b)%MOD; }
int mul(int a, int b){ return (a*b)%MOD; }
int expo(int a, int b){
	if(b==0) return 1;
	int te = expo(a, b/2); te = mul(te,te);
	return (b%2 ? mul(te,a) : te);
}
void chmul(int &a, int b){ a = (a*b)%MOD; }
void chmn(auto &a, auto b){ a = min(a, b); }
void chmx(auto &a, auto b){ a = max(a, b); }

int n, l[MAXN], r[MAXN];
vector<pii> adj[MAXN];
int dis[MAXN], ans[MAXN];
int q[2*MAXN], le=MAXN, ri=MAXN-1;
int cnt;

void bfs(int sta){
	le = MAXN; ri = MAXN-1;
	for(int i=1; i<=cnt; i++) dis[i] = INF;
	dis[sta] = 0; q[++ri] = sta;

	while(le <= ri){
		auto nw = q[le]; le++;

		for(auto [nx, ty] : adj[nw]){
			if(ty){
				if(dis[nx] > dis[nw]+1){
					dis[nx] = dis[nw]+1; q[++ri] = nx;
				}
			} else {
				if(dis[nx] > dis[nw]){
					dis[nx] = dis[nw]; q[--le] = nx;
				}
			}
		} 
	}
}
void solve(){
	le = MAXN; ri = MAXN-1;
	for(int i=1; i<=cnt; i++){
		dis[i] = ans[i];
		q[++ri] = i;
	} 

	while(le <= ri){
		auto nw = q[le]; le++;

		for(auto [nx, ty] : adj[nw]){
			if(ty){
				if(dis[nx] > dis[nw]+1){
					dis[nx] = dis[nw]+1; q[++ri] = nx;
				}
			} else {
				if(dis[nx] > dis[nw]){
					dis[nx] = dis[nw]; q[--le] = nx;
				}
			}
		} 
	}
}

void bd(int id, int l, int r){
	chmx(cnt, 2*n + id);
	if(id != 1)
		adj[2*n + id].pb({2*n + (id>>1), 0});
	if(l==r){
		adj[l].pb({2*n + id, 0});
		return;
	}

	bd(lf,l,md); bd(rg,md+1,r);
}
void upd(int id, int l, int r, int x, int y, int des){
	if(x<=l && r<=y){ adj[2*n + id].pb({des, 0}); return; }
	if(r<x || y<l) return;
	upd(lf,l,md,x,y,des); upd(rg,md+1,r,x,y,des);
}
signed main(){
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>n;
	cnt = n;
	for(int i=1; i<=n; i++){
		cin>>l[i]>>r[i];
		l[i] = 1; r[i] = n;

		adj[++cnt].pb({i, 1});
		upd(1, 1, n, l[i], r[i], cnt);
		// for(int j=l[i]; j<=r[i]; j++){
		// 	adj[j].pb({cnt, 0});
		// }
	}
	bd(1,1,n);
	// cout << cnt << " cnt\n";

	bfs(1);
	for(int i=1; i<=cnt; i++) ans[i] = dis[i];
	// for(int i=1; i<=cnt; i++) cout << i << ' ' << ans[i] << " ans\n";

	bfs(n);
	for(int i=1; i<=cnt; i++) ans[i] += dis[i];

	solve();

	int Q;cin>>Q; 
	while(Q--){
		int x; cin>>x;
		cout << (dis[x] >= INF ? -1 : dis[x]) << '\n';
	}
}

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