oj.uz

답안 #535869

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
535869 2022-03-11T15:07:54 Z __Variatto Toll (BOI17_toll) C++17
0 / 100
 47 ms 7628 KB 
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define ll long long
const int MAX=5e4+10;
const int MAXV=1e9+10;///////////////
int k, n, m, o, a, b, w, wyn[MAX], odl[MAX];
pair<int,int>zap[MAX];
vector<pair<int,int>>g[MAX], g2[MAX];
vector<int> nrzap[MAX];
bool odw[MAX];
priority_queue<pair<int,int>>kol;
void dijkstra(int p){
    while(kol.size()){
        auto v=kol.top();
        kol.pop();
        v.fi*=-1;
        if(odw[v.se]) continue;
        odw[v.se]=true;
        for(auto s: g[v.se])
            if(s.fi/k<=p && odl[s.fi]>v.fi+s.se)
                odl[s.fi]=v.fi+s.se, kol.push({-odl[s.fi], s.fi});
    }
}
void dijkstra2(int l){
    while(kol.size()){
        auto v=kol.top();
        kol.pop();
        v.fi*=-1;
        if(odw[v.se]) continue;
        odw[v.se]=true;
        for(auto s: g2[v.se])
            if(s.fi/k>=l && odl[s.fi]>v.fi+s.se)
                odl[s.fi]=v.fi+s.se, kol.push({-odl[s.fi], s.fi});
    }
}
void rek(int a, int b){
    if(a==b) return;
    int sr=(a+b)/2;
    for(int j=k*sr; j<k*(sr+1); j++){
        for(int i=k*sr; i<k*(b+1); i++)
            odw[i]=false, odl[i]=MAXV;
        kol.push({0, j}), odl[j]=0;
        dijkstra(b);
        for(int i=k*(sr+1)-1; i>=(k*a); i--)
            odw[i]=false, odl[i]=MAXV;
        kol.push({0, j}), odl[j]=0;
        dijkstra2(a);
/*        if(sr==1){
            cout<<j<<": "<<"\n";
            for(int i=k*sr; i<k*(b+1); i++) 
                cout<<i<<": "<<odl[i]<<"\n";

            for(int i=k*sr; i>=(k*a); i--)
                    cout<<i<<": "<<odl[i]<<"\n";;
            cout<<"\n";
        }
*/        for(int i=k*(sr+1)-1; i>=k*a; i--){
            for(auto x:nrzap[i]){
                if(zap[x].se>=k*(sr+1)-1 && zap[x].se<k*(b+1)){
//                    cout<<x<<" "<<zap[x].se<<" "<<i<<"x "<<odl[i]<<" "<<odl[zap[x].se]<<"\n";
                    wyn[x]=min(wyn[x], odl[i]+odl[zap[x].se]);
                }
            }
        }
    }
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    cin>>k>>n>>m>>o;
    for(int i=1; i<=m; i++){
        cin>>a>>b>>w;
        g[a].pb({b, w}), g2[b].pb({a, w});
    }
    for(int i=1; i<=o; i++){
        cin>>zap[i].fi>>zap[i].se;
        wyn[i]=MAXV;
        nrzap[zap[i].fi].pb(i);
    }
    rek(0, n/k);
    for(int i=1; i<=o; i++){
        if(wyn[i]==MAXV)
            cout<<-1<<"\n";
        else
            cout<<wyn[i]<<"\n";
    }
}

Subtask #1
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 31 ms 7628 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 47 ms 7436 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 3796 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 3796 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 44.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 31 ms 7628 KB Output isn't correct
2 Halted 0 ms 0 KB -