제출 #596235

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
596235		Deepesson	Event Hopping (BOI22_events)	C++17	0 / 100	1597 ms	18396 KiB

events

#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(){
    for(int i=0;i!=N;++i){
        int max=1e9+1,pep=-1;
        int l = eventos[i].first,r=eventos[i].second;
        for(int i=0;i!=eventos.size();++i){
            auto x = eventos[i];
            if(x.second>=l&&x.second<=r){
                if(x.first<max){
                    max=x.first;
                    pep=i;
                }
            }
        }
        jump[i][0]=pep;
    }
}

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 i=0;i!=N;++i)if(jump[i][0]==i)jump[i][0]=-1;
    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);
           // std::cout<<"obteve "<<q<<" "<<" "<<l<<" "<<r<<" "<<m<<"\n";
            if(eventos[q].first<=cord){
                r=m;
            }else l=m+1;
        }

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

컴파일 시 표준 에러 (stderr) 메시지

events.cpp: In function 'void gera_conexoes()':
events.cpp:27:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |         for(int i=0;i!=eventos.size();++i){
      |                     ~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30