oj.uz

답안 #596285

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
596285 2022-07-14T14:38:04 Z Deepesson Event Hopping (BOI22_events) C++17
0 / 100
 373 ms 25692 KB 
#include <bits/stdc++.h>
#define MAX 200010
#define LSB(A) (A&(-A))
#define LOG 20
int N,Q;
typedef std::pair<int,int> pii;
std::vector<pii> eventos;

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

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

int ft[MAX];

typedef std::pair<int,int*> pipo;
int custos[101000];
int trava;

int armazena[MAX];
int valor[MAX];
int jump[MAX][LOG];

void gera_conexoes(){
    std::deque<pii> st;
    ///Menor indice L em que o final esteja presente entre L e R
    for(int i=MAX-1;i!=-1;--i){
        ///Adiciona o finalzinho
        pii menor = {1e9+1,1e9+1};
        for(auto&x:rem[i]){
            pii conj = {eventos[x].first,x};
            menor=std::min(menor,conj);
        }
        if(menor.first!=1e9+1){
            while(st.size()&&st.front().first>=menor.first){
                st.pop_front();
            }
            st.push_front(menor);
        }
        ///Pega o valor
        for(auto&x:add[i]){
            int l=0,r=st.size()-1;
            while(l<r){
                int m = (l+r+1)/2;
                if(eventos[st[m].second].second<=eventos[x].second){
                    l=m;
                }else r=m-1;
            }
            jump[x][0]=st[l].second;
        }
    }
}

int jumps(int a,int b){
    int pos = a;
    for(int i=LOG-1;i!=-1;--i){
        if(((1<<i)&b)&&jump[pos][i]!=-1){
            pos=jump[pos][i];
        }
    }
    return pos;
}

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,&x.first});
            comprime.push_back({x.second,&x.second});
        }
        std::sort(comprime.begin(),comprime.end());
        int last=-1,cord=1;
        for(auto&x:comprime){
            if(x.first!=last){
                last=x.first;
                ++cord;
            }
            *x.second=cord;
        }
        trava=cord;
    }
    for(int i=0;i!=N;++i){
        add[eventos[i].first].push_back(i);
        rem[eventos[i].second].push_back(i);
    }
    gera_conexoes();
    for(int j=1;j!=LOG;++j){
        for(int i=0;i!=N;++i){
            if(jump[i][j-1]==-1)jump[i][j]=-1;
            else
            jump[i][j]=jump[jump[i][j-1]][j-1];
        }
    }

    for(int i=0;i!=Q;++i){
        int s,t;
        std::cin>>s>>t;
        --s;--t;
        if(s==t){
            std::cout<<"0\n";
            continue;
        }
        if(eventos[t].first<eventos[s].second){
            std::cout<<"impossible\n";
            continue;
        }
        int cord = eventos[s].second;

        int l=0,r=1e9;
        while(l<r){
            int m = (l+r)/2;
            int q=jumps(t,m);
            if(eventos[q].first<=cord){
                r=m;
            }else l=m+1;
        }

        int q=jumps(t,l);
        if(q!=s){
            ++l;
        }
        if(r==1e9){
            std::cout<<"impossible\n";
            continue;
        }
        std::cout<<l<<"\n";
    }
}

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 9684 KB Output is correct
2 Correct 212 ms 25092 KB Output is correct
3 Correct 234 ms 25308 KB Output is correct
4 Correct 373 ms 25176 KB Output is correct
5 Correct 252 ms 25220 KB Output is correct
6 Correct 267 ms 25236 KB Output is correct
7 Correct 241 ms 25372 KB Output is correct
8 Incorrect 214 ms 25692 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 9684 KB Output is correct
2 Correct 7 ms 9684 KB Output is correct
3 Correct 7 ms 9812 KB Output is correct
4 Correct 7 ms 9812 KB Output is correct
5 Correct 7 ms 9812 KB Output is correct
6 Incorrect 6 ms 9812 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 9684 KB Output is correct
2 Correct 7 ms 9684 KB Output is correct
3 Correct 7 ms 9812 KB Output is correct
4 Correct 7 ms 9812 KB Output is correct
5 Correct 7 ms 9812 KB Output is correct
6 Incorrect 6 ms 9812 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 9684 KB Output is correct
2 Correct 7 ms 9684 KB Output is correct
3 Correct 7 ms 9812 KB Output is correct
4 Correct 7 ms 9812 KB Output is correct
5 Correct 7 ms 9812 KB Output is correct
6 Incorrect 6 ms 9812 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 210 ms 25204 KB Output is correct
2 Correct 270 ms 25200 KB Output is correct
3 Correct 372 ms 25224 KB Output is correct
4 Correct 210 ms 25632 KB Output is correct
5 Correct 265 ms 25548 KB Output is correct
6 Incorrect 246 ms 25344 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 9684 KB Output is correct
2 Correct 212 ms 25092 KB Output is correct
3 Correct 234 ms 25308 KB Output is correct
4 Correct 373 ms 25176 KB Output is correct
5 Correct 252 ms 25220 KB Output is correct
6 Correct 267 ms 25236 KB Output is correct
7 Correct 241 ms 25372 KB Output is correct
8 Incorrect 214 ms 25692 KB Output isn't correct
9 Halted 0 ms 0 KB -