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Submission #595598

# Submission time Handle Problem Language Result Execution time Memory
595598 2022-07-13T21:02:15 Z Deepesson Event Hopping (BOI22_events) C++17
0 / 100
 40 ms 5600 KB 
#include <bits/stdc++.h>
#define MAX 5005
int N,Q;
typedef std::pair<int,int> pii;
std::vector<pii> eventos;

std::vector<int> add[MAX];

std::vector<int> rem[MAX];

int tab[MAX*4];
int limpa[MAX*4];
int rodada=42;

void checa(int x){
    if(limpa[x]!=rodada){
        limpa[x]=rodada;
        tab[x]=1e9;
    }
}
int query(int l,int r,int la=0,int ra=MAX-1,int pos=1){
    checa(pos);
    if(la>r||ra<l)return 1e9;
    if(la>=l&&ra<=r){
        return tab[pos];
    }
    int m = (la+ra)/2;
    return std::min(query(l,r,la,m,pos*2),query(l,r,m+1,ra,(pos*2)+1));
}

void update(int t,int k,int la=0,int ra=MAX-1,int pos=1){
    checa(pos);
    if(la>t||ra<t)return;
    if(la==ra){
        tab[pos]=std::min(tab[pos],k);
        return;
    }
    int m = (la+ra)/2;
    if(t<=m)
    update(t,k,la,m,pos*2);
    else
    update(t,k,m+1,ra,(pos*2)+1);
    checa(pos*2);
    checa((pos*2)+1);
    tab[pos]=std::min(tab[pos*2],tab[(pos*2)+1]);
}

typedef std::pair<int,int*> pipo;
int custos[101000];
int trava;
void simula(int x){
    ++rodada;
    update(eventos[x].second,1);
    for(int i=eventos[x].second;i!=trava+1;++i){
        int minimo=1e9;
        for(auto&x:rem[i]){
            int d = query(eventos[x].first,i);
            custos[x]=d;
            minimo=std::min(minimo,d+1);
        }
        update(i,minimo);
        for(auto&x:rem[i]){
            custos[x]=std::min(custos[x],minimo);
        }
    }
    custos[x]=0;
}
int tabp5[5005][5005];
int main()
{
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    std::cout.tie(0);
    std::cin>>N>>Q;
    for(int i=0;i!=N;++i){
        int a,b;
        std::cin>>a>>b;
        eventos.push_back({a,b});
    }

    {
        std::vector<pipo> comprime;
        for(auto&x:eventos){
            comprime.push_back({x.first*2,&x.first});
            comprime.push_back({x.second*2 + (1),&x.second});
        }
        std::sort(comprime.begin(),comprime.end());
        int last=-1,cord=1;
        for(auto&x:comprime){
            if(x.first&1){
                if(last==x.first-1){
                    *x.second=cord;
                }else *x.second=cord+1;
            }
            if(x.first!=last){
                last=x.first;
                ++cord;
            }
            *x.second=cord;
        }
        trava=cord;
    }
    for(int i=0;i!=N;++i){
        rem[eventos[i].second].push_back(i);
    }
    if(N<=5005){
        for(int i=0;i!=N;++i){
            simula(i);
            for(int j=0;j!=N;++j)
                tabp5[i][j]=custos[j];
        }
        for(int i=0;i!=Q;++i){
            int a,b;
            std::cin>>a>>b;
            --a;--b;
            int d = tabp5[a][b];
            if(d>1e6){
                std::cout<<"impossible\n";
            }else {
                std::cout<<d<<"\n";
            }
        }
        return 0;
    }
    for(int i=0;i!=Q;++i){
        int a,b;
        std::cin>>a>>b;
        --a;--b;
        simula(a);
        int d = custos[b];
        if(d>1e6){
            std::cout<<"impossible\n";
        }else {
            std::cout<<d<<"\n";
        }
    }
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 596 KB Output is correct
2 Runtime error 40 ms 5596 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 596 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 596 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 596 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 39 ms 5600 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 596 KB Output is correct
2 Runtime error 40 ms 5596 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -