oj.uz

Submission #924581

# Submission time Handle Problem Language Result Execution time Memory
924581 2024-02-09T08:32:10 Z yeediot Olympic Bus (JOI20_ho_t4) C++14
0 / 100
 199 ms 4824 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define sz(x) (int)(x.size())
#define all(x) x.begin(),x.end()
#define F first
#define S second
#define pb push_back
#ifdef local
void setio(){freopen("/Users/iantsai/Library/Mobile Documents/com~apple~CloudDocs/cpp/Empty.md","r",stdin);}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
struct edge{
    int a,b,c,d;
};
const int mxn=405;
vector<edge>e;
vector<int>temp;
pii parent[mxn];
int id[mxn];
pair<pii,int> w[mxn][mxn];
map<pii,bool>mp;
void upd(pair<pii,int> &p,int x,int y,int z){
    if(x<p.F.F){
        p={{x,y},z};
    }
    else if(x==p.F.F and y<p.F.S){
        p.F.S=y;
        p.S=z;
    }
}
vector<int> dij(int st,int n){
    vector<int>dis(mxn);
    for(int i=0;i<mxn;i++)dis[i]=1e9;
    dis[st]=0;
    for(int i=1;i<=n;i++){
        parent[i]={-1,8e18};
    }
    vector<bool>used(n+1,0);
    for(int i=1;i<=n;i++){
        int t=-1;
        for(int j=1;j<=n;j++){
            if(used[j])continue;
            if(t==-1 or dis[j]<dis[t]){
                t=j;
            }
        }
        used[t]=1;
        for(int j=1;j<=n;j++){
            if(dis[t]+w[t][j].F.F<dis[j]){
                dis[j]=dis[t]+w[t][j].F.F;
                parent[j]={t,w[t][j].F.F+w[t][j].F.S};
                id[j]=w[t][j].S;
            }
            else if(dis[t]+w[t][j].F.F==dis[j]){
                parent[j]={t,w[t][j].F.F+w[t][j].F.S};
                id[j]=w[t][j].S;
            }
        }
    }
    return dis;
}
vector<int> rdij(int st,int n){
    vector<int>dis(mxn);
    for(int i=0;i<mxn;i++)dis[i]=1e9;
    dis[st]=0;
    for(int i=1;i<=n;i++){
        parent[i]={-1,8e18};
    }
    vector<bool>used(n+1,0);
    for(int i=1;i<=n;i++){
        int t=-1;
        for(int j=1;j<=n;j++){
            if(used[j])continue;
            if(t==-1 or dis[j]<dis[t]){
                t=j;
            }
        }
        used[t]=1;
        for(int j=1;j<=n;j++){
            if(dis[t]+w[j][t].F.F<dis[j]){
                dis[j]=dis[t]+w[j][t].F.F;
                parent[j]={t,w[j][t].F.F+w[j][t].F.S};
                id[j]=w[j][t].S;
            }
            else if(dis[t]+w[j][t].F.F==dis[j]){
                parent[j]={t,w[j][t].F.F+w[j][t].F.S};
                id[j]=w[j][t].S;
            }
        }
    }
    return dis;
}
vector<int> dij2(int st,int n){
    vector<int>dis(mxn);
    for(int i=0;i<mxn;i++)dis[i]=1e9;
    dis[st]=0;
    vector<bool>used(n+1,0);
    for(int i=1;i<=n;i++){
        int t=-1;
        for(int j=1;j<=n;j++){
            if(used[j])continue;
            if(t==-1 or dis[j]<dis[t]){
                t=j;
            }
        }
        used[t]=1;
        for(int j=1;j<=n;j++){
            if(dis[t]+w[t][j].F.F<dis[j]){
                dis[j]=dis[t]+w[t][j].F.F;
            }
        }
    }
    return dis;
}vector<int> rdij2(int st,int n){
    vector<int>dis(mxn);
    for(int i=0;i<mxn;i++)dis[i]=1e9;
    dis[st]=0;
    vector<bool>used(n+1,0);
    for(int i=1;i<=n;i++){
        int t=-1;
        for(int j=1;j<=n;j++){
            if(used[j])continue;
            if(t==-1 or dis[j]<dis[t]){
                t=j;
            }
        }
        used[t]=1;
        for(int j=1;j<=n;j++){
            if(dis[t]+w[j][t].F.F<dis[j]){
                dis[j]=dis[t]+w[j][t].F.F;
            }
        }
    }
    return dis;
}
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    setio();
    int n,m;
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        parent[i]={-1,-1};
        for(int j=1;j<=n;j++){
            w[i][j]={{1e18,1e18},1e18};
        }
    }
    for(int i=0;i<m;i++){
        int a,b,c,d;
        cin>>a>>b>>c>>d;
        e.pb({a,b,c,d});
        upd(w[a][b],c,d,i);
        //cout<<w[a][b].S<<'\n';
    }
    vector<int>temp2;
    temp2=dij2(n,n);
    temp=dij(1,n);
    int ans=temp[n]+temp2[1];
    //cout<<ans<<'\n';
    vector<bool>used(m+1,0);
    for(int i=1;i<=n;i++){
        //cout<<w[parent[i].F][]<<' ';
        if(parent[i].F==-1)continue;
        auto x=w[parent[i].F][i];
        //if(x.F.F==1e18)continue;
        used[x.S]=1;
        //cout<<x.S<<' '<<i<<' '<<parent[i].F<<' '<<parent[i].S<<' ';
        x=w[i][parent[i].F];
        w[i][parent[i].F].F.F=min(parent[i].S,w[i][parent[i].F].F.F);
        temp2=rdij2(1,n);
        temp=dij2(1,n);
        //for(int j=1;j<=n;j++)cout<<temp[j]<<','<<temp2[j]<<' ';
        //    cout<<'\n';
        ans=min(ans,temp[n]+temp2[n]);
        w[i][parent[i].F]=x;
    }
    temp2=dij(1,n);
    temp=rdij(n,n);
    for(int i=1;i<=n;i++){
        if(parent[i].F==-1)continue;
        auto x=w[i][parent[i].F];
        used[x.S]=1;
        x=w[parent[i].F][i];
        w[parent[i].F][i].F.F=min(parent[i].S,w[parent[i].F][i].F.F);
        temp2=dij2(n,n);
        temp=rdij2(n,n);
        ans=min(ans,temp[1]+temp2[1]);
        w[parent[i].F][i]=x;
    }
    temp2=dij(n,n);
    temp=rdij(1,n);
    for(int i=1;i<=n;i++){
        if(parent[i].F==-1)continue;
        auto x=w[i][parent[i].F];
        used[x.S]=1;
        x=w[parent[i].F][i];
        w[parent[i].F][i].F.F=min(parent[i].S,w[parent[i].F][i].F.F);
        temp2=dij2(1,n);
        temp=rdij2(1,n);
        ans=min(ans,temp[n]+temp2[n]);
        w[parent[i].F][i]=x;
    }
    temp2=rdij(1,n);
    temp=dij(n,n);
    for(int i=1;i<=n;i++){
        if(parent[i].F==-1)continue;
        auto x=w[parent[i].F][i];
        used[x.S]=1;
        x=w[i][parent[i].F];
        w[i][parent[i].F].F.F=min(parent[i].S,w[i][parent[i].F].F.F);
        temp2=rdij2(n,n);
        temp=dij2(n,n);
        ans=min(ans,temp[1]+temp2[1]);
        w[i][parent[i].F]=x;
    }
    temp2=dij(n,n);
    temp=dij(1,n);
    for(int i=0;i<m;i++){
        if(used[i])continue;
        auto [a,b,c,d]=e[i];
        ans=min(ans,min(temp[n],temp[b]+c+d+temp2[a])+min(temp2[1],temp2[b]+c+d+temp[a]));
        //cout<<ans<<'\n';
    }
    if(ans>=1e9){
        cout<<-1<<'\n';
        return 0;
    }
    cout<<ans<<'\n';
}
/*
how to deal with 重邊
*/

Compilation message

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:225:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  225 |         auto [a,b,c,d]=e[i];
      |              ^

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 166 ms 2652 KB Output is correct
2 Correct 111 ms 2680 KB Output is correct
3 Correct 181 ms 2720 KB Output is correct
4 Correct 175 ms 2648 KB Output is correct
5 Correct 2 ms 2648 KB Output is correct
6 Correct 38 ms 2652 KB Output is correct
7 Incorrect 0 ms 348 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 199 ms 4824 KB Output is correct
2 Incorrect 195 ms 4820 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 170 ms 2716 KB Output is correct
2 Correct 124 ms 2680 KB Output is correct
3 Correct 168 ms 4820 KB Output is correct
4 Correct 120 ms 2848 KB Output is correct
5 Correct 170 ms 4820 KB Output is correct
6 Incorrect 1 ms 344 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 166 ms 2652 KB Output is correct
2 Correct 111 ms 2680 KB Output is correct
3 Correct 181 ms 2720 KB Output is correct
4 Correct 175 ms 2648 KB Output is correct
5 Correct 2 ms 2648 KB Output is correct
6 Correct 38 ms 2652 KB Output is correct
7 Incorrect 0 ms 348 KB Output isn't correct
8 Halted 0 ms 0 KB -