oj.uz

Submission #757186

# Submission time Handle Problem Language Result Execution time Memory
757186 2023-06-12T18:49:35 Z groshi Olympic Bus (JOI20_ho_t4) C++17
0 / 100
 33 ms 1844 KB 
#pragma GCC optimize("O3","unroll-loops","Ofast")
#include<iostream>
#include<vector>
#include<queue>
#include<map>
using namespace std;
struct wi{
    vector<int> Q;
    int odw=0;
    long long kiedy_odw=1e18;
    int od_kogo=0;
}*w;
long long wynik=1e18;
int kiedy=1;
int n;
int t[60000][4];
long long odl[210][210];
map<int,int> nalezy;
void dijkstra(int kto)
{
    priority_queue<pair<long long,pair<int,int> > > kolejka;
    kolejka.push({0,{1,0}});
    while(!kolejka.empty())
    {
        pair<long long,pair<int,int> > para=kolejka.top();
        int x=para.second.first;
        kolejka.pop();
        if(w[x].kiedy_odw-para.first)
            continue;
        w[x].od_kogo=para.second.second;
        w[x].odw=kiedy;
        w[x].kiedy_odw=-para.first;
        for(int i=0;i<w[x].Q.size();i++)
        {
            int ile=w[x].Q[i];
            if(ile==kto)
                continue;
            int y;
            if(ile<0)
                y=t[-ile][3];
            else y=t[ile][0];
            int koszt=t[abs(ile)][1];
            if(w[y].kiedy_odw<=-para.first+koszt)
                continue;
            w[y].kiedy_odw=-para.first+koszt;
            kolejka.push({para.first-koszt,{y,ile}});
        }
    }
    long long d1=w[n].kiedy_odw;
    bool git1=0,git2=0;
    if(w[n].odw==kiedy)
        git1=1;
    if(kto==0 && w[n].odw==kiedy)
    {
        int jestem=n;
        while(jestem!=1)
        {
            nalezy[w[jestem].od_kogo]=1;
            int x,y;
            x=t[w[jestem].od_kogo][0];
            y=t[w[jestem].od_kogo][3];
            if(x==jestem)
                jestem=y;
            else jestem=x;
        }
    }
    kiedy++;
    kolejka.push({0,{n,0}});
    while(!kolejka.empty())
    {
        pair<long long,pair<int,int> > para=kolejka.top();
        int x=para.second.first;
        kolejka.pop();
        if(w[x].kiedy_odw<-para.first)
            continue;
        w[x].od_kogo=para.second.second;
        w[x].odw=kiedy;
        w[x].kiedy_odw=-para.first;
        for(int i=0;i<w[x].Q.size();i++)
        {
            int ile=w[x].Q[i];
            if(ile==kto)
                continue;
            int y;
            if(ile<0)
                y=t[-ile][3];
            else y=t[ile][0];
            int koszt=t[abs(ile)][1];
             if(w[y].kiedy_odw<=-para.first+koszt)
                continue;
            w[y].kiedy_odw=-para.first+koszt;
            kolejka.push({para.first-koszt,{y,ile}});
        }
    }
    if(w[1].odw==kiedy)
        git2=1;
    if(kto==0 && w[1].odw==kiedy)
    {
        int jestem=1;
        while(jestem!=n)
        {
            nalezy[w[jestem].od_kogo]=1;
            int x,y;
            x=t[w[jestem].od_kogo][0];
            y=t[w[jestem].od_kogo][3];
            if(x==jestem)
                jestem=y;
            else jestem=x;
        }
    }
    long long d2=w[1].kiedy_odw;
    if(git1==1 && git2==1)
    wynik=min(wynik,d1+d2+t[kto][2]);
}
int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int m,x,y,a,b;
    cin>>n>>m;
    w=new wi[n+3];
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
            odl[i][j]=1e18;
    for(int i=1;i<=m;i++)
    {
        cin>>x>>y>>a>>b;
        w[x].Q.push_back(i);
        t[i][0]=y;
        t[i][1]=a;
        t[i][2]=b;
        t[i][3]=x;
        odl[x][y]=min(odl[x][y],(long long)a);
    }
    for(int i=1;i<=n;i++)
        odl[i][i]=0;
    for(int k=1;k<=n;k++)
        for(int i=1;i<=n;i++)
            for(int j=1;j<=n;j++)
                odl[i][j]=min(odl[i][j],odl[i][k]+odl[k][j]);
    dijkstra(0);
    kiedy++;
    for(auto it=nalezy.begin();it!=nalezy.end();it++)
    {
        int i=it->first;
        int odwr=t[i][0];
        int pocz=t[i][3];
        w[odwr].Q.push_back(-i);
        dijkstra(i);
        kiedy++;
        w[odwr].Q.pop_back();
    }
    wynik=min(wynik,odl[n][1]+odl[1][n]);
    for(int i=1;i<=m;i++)
    {
        if(nalezy.find(i)!=nalezy.end())
            continue;
        int x=t[i][3];
        int y=t[i][0];
        int odwr=t[i][2];
        int koszt=t[i][1];
        wynik=min(wynik,odl[1][n]+odl[n][y]+odl[x][1]+odwr+koszt);
        wynik=min(wynik,odl[n][1]+odl[x][n]+odl[1][y]+odwr+koszt);
        wynik=min(wynik,odl[1][y]+odl[x][n]+odl[n][y]+odl[x][1]+odwr+2*koszt);
    }
    if(wynik>=1e18)
        cout<<"-1";
    else cout<<wynik;
    return 0;
}

Compilation message

ho_t4.cpp: In function 'void dijkstra(int)':
ho_t4.cpp:33:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         for(int i=0;i<w[x].Q.size();i++)
      |                     ~^~~~~~~~~~~~~~
ho_t4.cpp:79:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |         for(int i=0;i<w[x].Q.size();i++)
      |                     ~^~~~~~~~~~~~~~
ho_t4.cpp: In function 'int32_t main()':
ho_t4.cpp:148:13: warning: unused variable 'pocz' [-Wunused-variable]
  148 |         int pocz=t[i][3];
      |             ^~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 596 KB Output is correct
2 Correct 8 ms 596 KB Output is correct
3 Correct 9 ms 596 KB Output is correct
4 Correct 12 ms 596 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 11 ms 596 KB Output is correct
7 Incorrect 0 ms 212 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 1764 KB Output is correct
2 Correct 24 ms 1844 KB Output is correct
3 Correct 29 ms 1812 KB Output is correct
4 Correct 9 ms 724 KB Output is correct
5 Correct 8 ms 596 KB Output is correct
6 Correct 8 ms 596 KB Output is correct
7 Correct 8 ms 596 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 31 ms 1748 KB Output is correct
10 Correct 27 ms 1748 KB Output is correct
11 Correct 23 ms 1748 KB Output is correct
12 Correct 33 ms 1788 KB Output is correct
13 Incorrect 31 ms 1820 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 596 KB Output is correct
2 Correct 8 ms 596 KB Output is correct
3 Correct 25 ms 1492 KB Output is correct
4 Correct 8 ms 596 KB Output is correct
5 Correct 31 ms 1800 KB Output is correct
6 Incorrect 0 ms 212 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 596 KB Output is correct
2 Correct 8 ms 596 KB Output is correct
3 Correct 9 ms 596 KB Output is correct
4 Correct 12 ms 596 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 11 ms 596 KB Output is correct
7 Incorrect 0 ms 212 KB Output isn't correct
8 Halted 0 ms 0 KB -