oj.uz

Submission #924762

# Submission time Handle Problem Language Result Execution time Memory
924762 2024-02-09T16:03:36 Z yeediot Olympic Bus (JOI20_ho_t4) C++14
0 / 100
 223 ms 8920 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];
pair<pii,int> scd[mxn][mxn];
map<pii,bool>mp;
void upd(pair<pii,int> &p,int x,int y,int z,int a,int b){
    if(x<p.F.F){
        scd[a][b]=p;
        p={{x,y},z};
    }
    else if(x==p.F.F and y<p.F.S){
        scd[a][b]=p;
        p.F.S=y;
        p.S=z;
    }
    else if(x==p.F.F or x<scd[a][b].F.F or (x==scd[a][b].F.F and y<scd[a][b].F.S)){
        scd[a][b]={{x,y},z};
    }
}
vector<int> dij(int st,int n){
    vector<int>dis(mxn);
    for(int i=0;i<mxn;i++)dis[i]=1e15;
    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] and w[t][j].F.F+w[t][j].F.S<parent[j].S){
                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]=1e15;
    dis[st]=0;
    for(int i=1;i<=n;i++){
        parent[i]={-1,1e15};
    }
    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] and w[j][t].F.F+w[j][t].F.S<parent[j].S){
                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]=1e15;
    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]=1e15;
    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};
            scd[i][j]=w[i][j];
        }
    }
    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,a,b);
    }
    vector<int>temp2;
    temp2=dij2(n,n);
    temp=dij(1,n);
    int ans=temp[n]+temp2[1];
    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];
        auto y=x;
        used[x.S]=1;
        w[parent[i].F][i]=scd[parent[i].F][i];
        //w[parent[i].F][i]=
        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=dij2(n,n);
        temp=dij2(1,n);
        ans=min(ans,temp[n]+temp2[1]);
        w[i][parent[i].F]=x;
        w[parent[i].F][i]=y;
    }
    temp=rdij(n,n);
    for(int i=1;i<=n;i++){
        if(parent[i].F==-1)continue;
        auto x=w[i][parent[i].F];
        auto y=x;
        used[x.S]=1;
        w[i][parent[i].F]=scd[i][parent[i].F];
        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=rdij2(1,n);
        temp=rdij2(n,n);
        ans=min(ans,temp[1]+temp2[n]);
        w[parent[i].F][i]=x;
        w[i][parent[i].F]=y;
    }
    temp=rdij(1,n);
    for(int i=1;i<=n;i++){
        if(parent[i].F==-1)continue;
        auto x=w[i][parent[i].F];
        auto y=x;
        w[i][parent[i].F]=scd[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=rdij2(n,n);
        temp=rdij2(1,n);
        ans=min(ans,temp[n]+temp2[1]);
        w[parent[i].F][i]=x;
        w[i][parent[i].F]=y;
    }
    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;
        auto y=w[parent[i].F][i];
        w[parent[i].F][i]=scd[parent[i].F][i];
        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=dij2(1,n);
        temp=dij2(n,n);
        ans=min(ans,temp[1]+temp2[n]);
        w[i][parent[i].F]=x;
        w[parent[i].F][i]=y;
    }
    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+temp2[a])+min(temp2[1],temp2[b]+c+temp[a])+d);
        //cout<<ans<<'\n';
    }
    if(ans>=(int)1e15){
        cout<<-1<<'\n';
        return 0;
    }
    cout<<ans<<'\n';
}
/*
*/

Compilation message

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:236:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  236 |         auto [a,b,c,d]=e[i];
      |              ^

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 171 ms 6748 KB Output is correct
2 Correct 116 ms 6748 KB Output is correct
3 Correct 182 ms 7000 KB Output is correct
4 Correct 186 ms 6744 KB Output is correct
5 Correct 2 ms 4696 KB Output is correct
6 Correct 41 ms 6748 KB Output is correct
7 Correct 1 ms 2392 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 185 ms 6864 KB Output is correct
11 Correct 193 ms 6844 KB Output is correct
12 Correct 189 ms 6844 KB Output is correct
13 Incorrect 82 ms 6748 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 223 ms 8920 KB Output is correct
2 Incorrect 204 ms 8920 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 171 ms 6748 KB Output is correct
2 Correct 130 ms 6996 KB Output is correct
3 Correct 170 ms 8920 KB Output is correct
4 Correct 124 ms 6744 KB Output is correct
5 Correct 169 ms 8920 KB Output is correct
6 Correct 0 ms 2392 KB Output is correct
7 Correct 0 ms 2392 KB Output is correct
8 Incorrect 178 ms 8912 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 171 ms 6748 KB Output is correct
2 Correct 116 ms 6748 KB Output is correct
3 Correct 182 ms 7000 KB Output is correct
4 Correct 186 ms 6744 KB Output is correct
5 Correct 2 ms 4696 KB Output is correct
6 Correct 41 ms 6748 KB Output is correct
7 Correct 1 ms 2392 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 185 ms 6864 KB Output is correct
11 Correct 193 ms 6844 KB Output is correct
12 Correct 189 ms 6844 KB Output is correct
13 Incorrect 82 ms 6748 KB Output isn't correct
14 Halted 0 ms 0 KB -