| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 705430 | blacktulip | Olympic Bus (JOI20_ho_t4) | C++17 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
typedef long long lo;
typedef pair< lo,lo > PII;
#define fi first
#define se second
#define int long long
#define mp make_pair
#define endl "\n"
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)
const lo inf = 10000000000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 205;
const lo mod = 1000000007;
int n,m,k,flag,t,y[50005],z[50005],c[50005],d[50005],dist[li][li],cur1[li],value,par[li],ekstra1,ekstra2,ekstra3;
int cev;
bool vis[li],yolda[50005],yolda1[50005],yasak[50005];
string s;
vector<pair<int,pair<int,int>>> v[li],rv[li];
inline int in(){
int x;
scanf("%lld",&x);
return x;
}
inline void sp(bool cont){
priority_queue<pair<int,int>> pq;
pq.push({0,1});
for(int i=1;i<=n;i++){vis[i]=0;cur1[i]=inf;}
while(pq.size()){
int node=pq.top().se;
int co=-pq.top().fi;
pq.pop();
if(vis[node])continue;
vis[node]=1;
cur1[node]=co;
for(auto go:v[node]){
if(!vis[go.fi] && yasak[go.se.se]==0 && go.se.fi+co<cur1[go.fi]){cur1[go.fi]=go.se.fi+co;par[go.fi]=node;pq.push({-co-go.se.fi,go.fi});}
}
if(node==ekstra1){
if(!vis[ekstra2] && co+ekstra3<cur1[ekstra2]){cur1[ekstra2]=ekstra3+co;pq.push({-co-ekstra3,ekstra2});}
}
}
if(cont){value=cur1[n];return ;}
if(vis[n]==0)return ;
int node=n;
while(node!=1){
for(auto go:rv[node]){
if(go.fi==par[node]){node=go.fi;yolda[go.se.se]=1;break;}
}
}
}
inline void sp1(bool cont){
priority_queue<pair<int,int>> pq;
pq.push({0,n});
for(int i=1;i<=n;i++){vis[i]=0;cur1[i]=inf;}
while(pq.size()){
int node=pq.top().se;
int co=-pq.top().fi;
pq.pop();
if(vis[node])continue;
vis[node]=1;
cur1[node]=co;
for(auto go:v[node]){
if(!vis[go.fi] && yasak[go.se.se]==0 && go.se.fi+co<cur1[go.fi]){cur1[go.fi]=go.se.fi+co;par[go.fi]=node;pq.push({-co-go.se.fi,go.fi});}
}
if(node==ekstra1){
if(!vis[ekstra2] && co+ekstra3<cur1[ekstra2]){cur1[ekstra2]=ekstra3+co;pq.push({-co-ekstra3,ekstra2});}
}
}
if(cont){value=cur1[1];return ;}
if(vis[1]==0)return ;
int node=1;
while(node!=n){
for(auto go:rv[node]){
if(go.fi==par[node]){node=go.fi;yolda1[go.se.se]=1;break;}
}
}
}
int32_t main(void){
n=in(),m=in();
FOR{
for(int j=1;j<=n;j++){dist[i][j]=inf;}
dist[i][i]=0;
}
for(int i=1;i<=m;i++){
y[i]=in(),z[i]=in(),c[i]=in(),d[i]=in();
dist[y[i]][z[i]]=min(dist[y[i]][z[i]],c[i]);
v[y[i]].pb({z[i],{c[i],i}});
rv[z[i]].pb({y[i],{c[i],i}});
}
for(int i=1;i<=n;i++){
for(int j=1;j<=n;j++){
for(int jj=1;jj<=n;jj++){
dist[j][jj]=min(dist[j][jj],dist[j][i]+dist[i][jj]);
}
}
}
sp(0);
sp1(0);
//~ cout<<"**\n";
cev=min(inf,dist[1][n]+dist[n][1]);
for(int i=1;i<=m;i++){
if(yolda[i]==0 && yolda1[i]==0){
if(dist[1][n]!=inf && dist[n][z[i]]!=inf && dist[y[i]][1]!=inf)cev=min(cev,dist[1][n]+dist[n][z[i]]+dist[y[i]][1]+d[i]+c[i]);
if(dist[n][1]!=inf && dist[1][z[i]]!=inf && dist[y[i]][n]!=inf)cev=min(cev,dist[n][1]+dist[1][z[i]]+dist[y[i]][n]+d[i]+c[i]);
if(dist[n][z[i]]!=inf && dist[y[i]][1]!=inf && dist[1][z[i]]!=inf && dist[y[i]][n]!=inf)cev=min(cev,dist[n][z[i]]+c[i]+dist[y[i]][1]+dist[1][z[i]]+dist[y[i]][n]+d[i]+c[i]);
continue;
}
if(yolda[i] && yolda1[i]){
continue;
}
if(yolda[i]){
yasak[i]=1;
ekstra1=z[i];
ekstra2=y[i];
ekstra3=c[i];
sp(1);
yasak[i]=0;
if(value!=inf && min(min(dist[n][1],dist[n][z[i]]+dist[y[i]][1]+c[i]))!=inf)cev=min(cev,min(dist[n][1],dist[n][z[i]]+dist[y[i]][1]+c[i])+value+d[i]);
continue;
}
ekstra1=z[i];
ekstra2=y[i];
ekstra3=c[i];
yasak[i]=1;
sp1(1);
yasak[i]=0;
if(value!=inf && min(min(dist[n][1],dist[n][z[i]]+dist[y[i]][1]+c[i]))!=inf)cev=min(cev,min(dist[1][n],dist[1][z[i]]+dist[y[i]][n]+c[i])+value+d[i]);
}
if(cev>=inf)cev=-1;
printf("%lld\n",cev);
return 0;
}