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답안 #943685

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
943685 2024-03-11T18:03:58 Z andrei_boaca Passport (JOI23_passport) C++17
48 / 100
 2000 ms 189288 KB 
#include <bits/stdc++.h>
#pragma GCC optimize ("Ofast")
#pragma GCC optimize ("fast-math")
#pragma GCC optimize ("unroll-loops")
using namespace std;
typedef pair<int,int> pii;
int n,L[200005],R[200005],torgt[200005],tolft[200005],sufL[200005],prefR[200005],sol[200005];
pii d1[200005],dn[200005];
unordered_set<int> arb[4*200005];
int total=0;
vector<int> nodes;
void build(int nod,int st,int dr)
{
    arb[nod].clear();
    if(st==dr)
        return;
    int mij=(st+dr)/2;
    build(nod*2,st,mij);
    build(nod*2+1,mij+1,dr);
}
void update(int nod,int st,int dr,int a,int b, int val)
{
    if(st>=a&&dr<=b)
    {
        if(val>0)
            arb[nod].insert(val);
        else if(!arb[nod].empty())
            arb[nod].erase(-val);
        return;
    }
    int mij=(st+dr)/2;
    if(a<=mij)
        update(nod*2,st,mij,a,b,val);
    if(b>mij)
        update(nod*2+1,mij+1,dr,a,b,val);
}
void query(int nod,int st,int dr,int poz)
{
    for(int j:arb[nod])
        nodes.push_back(j);
    arb[nod].clear();
    if(st==dr)
        return;
    int mij=(st+dr)/2;
    if(poz<=mij)
        query(nod*2,st,mij,poz);
    else
        query(nod*2+1,mij+1,dr,poz);
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>n;
    for(int i=1;i<=n;i++)
        cin>>L[i]>>R[i];
    for(int i=1;i<=n;i++)
        prefR[i]=max(prefR[i-1],R[i]);
    sufL[n+1]=1e9;
    for(int i=n;i>=1;i--)
        sufL[i]=min(sufL[i+1],L[i]);
    torgt[n]=0;
    for(int i=n-1;i>=1;i--)
    {
        if(prefR[i]<=i)
            torgt[i]=-1;
        else
        {
            int j=prefR[i];
            if(torgt[j]==-1)
                torgt[i]=-1;
            else
                torgt[i]=1+torgt[j];
        }
    }
    tolft[1]=0;
    for(int i=2;i<=n;i++)
    {
        if(sufL[i]>=i)
            tolft[i]=-1;
        else
        {
            int j=sufL[i];
            if(tolft[j]==-1)
                tolft[i]=-1;
            else
                tolft[i]=1+tolft[j];
        }
    }
    for(int i=1;i<=n;i++)
    {
        d1[i]={-1,0};
        dn[i]={-1,0};
    }
    d1[1]={0,1};
    build(1,1,n);
    for(int i=2;i<=n;i++)
        update(1,1,n,L[i],R[i],i);
    set<pair<pii,int>> coada;
    coada.insert({{0,1},1});
    while(!coada.empty())
    {
        int val=(*coada.begin()).first.first;
        auto it=prev(coada.lower_bound({{val+1,0},0}));
        int nod=(*it).second;
        coada.erase(it);
        nodes.clear();
        query(1,1,n,nod);
        for(int j:nodes)
        {
            d1[j].first=d1[nod].first+1;
            d1[j].second=max(d1[nod].second,R[j]);
            update(1,1,n,L[j],R[j],-j);
            coada.insert({d1[j],j});
        }
    }
    dn[n]={0,n};
    build(1,1,n);
    for(int i=1;i<n;i++)
        update(1,1,n,L[i],R[i],i);
    coada.insert({{0,n},n});
    while(!coada.empty())
    {
        auto it=coada.begin();
        int nod=(*it).second;
        coada.erase(it);
        nodes.clear();
        query(1,1,n,nod);
        for(int j:nodes)
        {
            dn[j].first=dn[nod].first+1;
            dn[j].second=min(dn[nod].second,L[j]);
            update(1,1,n,L[j],R[j],-j);
            coada.insert({dn[j],j});
        }
    }
    for(int i=1;i<=n;i++)
    {
        sol[i]=1e9;
        if(d1[i].first!=-1)
        {
            int poz=d1[i].second;
            if(torgt[poz]!=-1)
                sol[i]=min(sol[i],d1[i].first+torgt[poz]);
        }
        if(dn[i].first!=-1)
        {
            int poz=dn[i].second;
            if(tolft[poz]!=-1)
                sol[i]=min(sol[i],dn[i].first+tolft[poz]);
        }
        if(sol[i]>n)
            sol[i]=-1;
    }
    int q;
    cin>>q;
    while(q--)
    {
        int x;
        cin>>x;
        cout<<sol[x]<<'\n';
    }
    return 0;
}

Subtask #1
0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 49756 KB Output is correct
2 Correct 11 ms 49756 KB Output is correct
3 Correct 14 ms 49752 KB Output is correct
4 Execution timed out 2094 ms 189288 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #2
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 49752 KB Output is correct
2 Correct 13 ms 49756 KB Output is correct
3 Correct 12 ms 49756 KB Output is correct
4 Correct 11 ms 49752 KB Output is correct
5 Correct 11 ms 49888 KB Output is correct
6 Correct 11 ms 49832 KB Output is correct
7 Correct 11 ms 49756 KB Output is correct
8 Correct 12 ms 49756 KB Output is correct
9 Correct 11 ms 49756 KB Output is correct
10 Correct 12 ms 49756 KB Output is correct
11 Correct 13 ms 49756 KB Output is correct
12 Correct 12 ms 49788 KB Output is correct
13 Correct 12 ms 50012 KB Output is correct
14 Correct 12 ms 50012 KB Output is correct
15 Correct 12 ms 49756 KB Output is correct

Subtask #3
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 49752 KB Output is correct
2 Correct 13 ms 49756 KB Output is correct
3 Correct 12 ms 49756 KB Output is correct
4 Correct 11 ms 49752 KB Output is correct
5 Correct 11 ms 49888 KB Output is correct
6 Correct 11 ms 49832 KB Output is correct
7 Correct 11 ms 49756 KB Output is correct
8 Correct 12 ms 49756 KB Output is correct
9 Correct 11 ms 49756 KB Output is correct
10 Correct 12 ms 49756 KB Output is correct
11 Correct 13 ms 49756 KB Output is correct
12 Correct 12 ms 49788 KB Output is correct
13 Correct 12 ms 50012 KB Output is correct
14 Correct 12 ms 50012 KB Output is correct
15 Correct 12 ms 49756 KB Output is correct
16 Correct 21 ms 50780 KB Output is correct
17 Correct 15 ms 50620 KB Output is correct
18 Correct 20 ms 51216 KB Output is correct
19 Correct 19 ms 51032 KB Output is correct
20 Correct 14 ms 50524 KB Output is correct
21 Correct 15 ms 50524 KB Output is correct
22 Correct 13 ms 50136 KB Output is correct
23 Correct 16 ms 50808 KB Output is correct
24 Correct 21 ms 51032 KB Output is correct

Subtask #4
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 49752 KB Output is correct
2 Correct 13 ms 49756 KB Output is correct
3 Correct 12 ms 49756 KB Output is correct
4 Correct 11 ms 49752 KB Output is correct
5 Correct 11 ms 49888 KB Output is correct
6 Correct 11 ms 49832 KB Output is correct
7 Correct 11 ms 49756 KB Output is correct
8 Correct 12 ms 49756 KB Output is correct
9 Correct 11 ms 49756 KB Output is correct
10 Correct 12 ms 49756 KB Output is correct
11 Correct 13 ms 49756 KB Output is correct
12 Correct 12 ms 49788 KB Output is correct
13 Correct 12 ms 50012 KB Output is correct
14 Correct 12 ms 50012 KB Output is correct
15 Correct 12 ms 49756 KB Output is correct
16 Correct 21 ms 50780 KB Output is correct
17 Correct 15 ms 50620 KB Output is correct
18 Correct 20 ms 51216 KB Output is correct
19 Correct 19 ms 51032 KB Output is correct
20 Correct 14 ms 50524 KB Output is correct
21 Correct 15 ms 50524 KB Output is correct
22 Correct 13 ms 50136 KB Output is correct
23 Correct 16 ms 50808 KB Output is correct
24 Correct 21 ms 51032 KB Output is correct
25 Correct 11 ms 49756 KB Output is correct
26 Correct 13 ms 49892 KB Output is correct
27 Correct 20 ms 51032 KB Output is correct
28 Correct 16 ms 50524 KB Output is correct
29 Correct 15 ms 50524 KB Output is correct
30 Correct 15 ms 50524 KB Output is correct
31 Correct 16 ms 50524 KB Output is correct

Subtask #5
0 / 46.0

# 결과 실행 시간 메모리 Grader output
1 Correct 19 ms 49756 KB Output is correct
2 Correct 11 ms 49756 KB Output is correct
3 Correct 14 ms 49752 KB Output is correct
4 Execution timed out 2094 ms 189288 KB Time limit exceeded
5 Halted 0 ms 0 KB -