제출 #545208

#제출 시각아이디문제언어결과실행 시간메모리
545208inluminasOlympic Bus (JOI20_ho_t4)C++17
0 / 100
129 ms7544 KiB
#include"bits/stdc++.h" using namespace std; #define ll long long #define endl "\n" #define fastio ios_base::sync_with_stdio(false) #define inf LLONG_MAX const ll lmt=201; vector<array<ll,3>>adj[lmt]; ll dis[lmt][lmt][2],node[lmt][lmt],e[lmt][lmt]; int main(){ fastio; ll n,m; cin>>n>>m; for(ll i=0;i<=n;i++){ for(ll j=0;j<=n;j++) for(ll k=0;k<2;k++) dis[i][j][k]=1e17; } vector<array<ll,3>>inv; for(ll i=1;i<=m;i++){ ll u,v,c,d; cin>>u>>v>>c>>d; inv.push_back({v,u,c+d}); adj[u].push_back({c,v,i}); } for(ll x=1;x<=n;x++){ dis[x][x][0]=0; set<array<ll,3>>q; q.insert({0,x,0}); while(!q.empty()){ auto it=q.begin(); ll val=(*it)[0],u=(*it)[1],ver=(*it)[2]; q.erase(it); if(dis[x][u][ver]<val) continue; for(auto p:adj[u]){ ll w=p[0],v=p[1],idx=p[2]; if(dis[x][v][0]>dis[x][u][ver]+w){ dis[x][v][0]=dis[x][u][ver]+w,node[x][v]=u,e[x][v]=idx; q.insert({dis[x][v][0],v,0}); }else if(dis[x][v][1]>dis[x][u][ver]+w){ dis[x][v][1]=dis[x][u][ver]+w; q.insert({dis[x][v][1],v,1}); } } } } ll ans=dis[1][n][0]+dis[n][1][0]; //cout<<dis[1][n][0]<<" "<<dis[n][1][0]<<endl; if(dis[1][n][0]<1e17){ ll x=n; map<ll,bool>used; while(x>1){ used[e[1][x]]=1,x=node[1][x]; } for(ll i=1;i<=m;i++){ ll u=inv[i-1][0],v=inv[i-1][1],val=inv[i-1][2],res; if(used[i]){ res=dis[1][v][0]+dis[u][n][0]+dis[v][u][1]+dis[n][u][0]+val+dis[v][1][0]; }else{ res=dis[1][n][0]+dis[n][u][0]+val+dis[v][1][0]; } ans=min(ans,res); } } if(dis[n][1][0]<1e17){ ll x=1; map<ll,bool>used; while(x<n){ used[e[n][x]]=1,x=node[n][x]; } for(ll i=1;i<=m;i++){ ll u=inv[i-1][0],v=inv[i-1][1],val=inv[i-1][2],res; if(used[i]){ res=dis[n][v][0]+dis[u][1][0]+dis[v][u][1]+dis[1][u][0]+val+dis[v][n][0]; }else{ res=dis[n][1][0]+dis[1][u][0]+val+dis[v][n][0]; } ans=min(ans,res); } } cout<<(ans>=1e17?-1:ans)<<endl; return 0; }
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