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  1. #include<bits/stdc++.h>
  2.  
  3. #define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  4. #define ll long long
  5. #define pii pair<int,int>
  6. #define pill pair<int,ll>
  7. #define pll pair<ll,ll>
  8. #define pb push_back
  9. #define fi first
  10. #define se second
  11. #define ff fi.fi
  12. #define fs fi.se
  13. #define sf se.fi
  14. #define ss se.se
  15. #define MASK(x) (((1)<<(x))-1)
  16. #define getbit(x,k) (((x)>>(k))&1)
  17.  
  18. using namespace std;
  19.  
  20. const int maxn=1e5+5,mod=1e9+22071997;
  21. const ll inf=1e18;
  22.  
  23. int n,m,k;
  24. vector<pii>eg[maxn];
  25. ll d[2][maxn];
  26. void dijkstra(int s, ll f[])
  27. {
  28.     fill(f+1,f+1+n,inf);f[s]=0;
  29.     priority_queue<pll,vector<pll>,greater<pll>>pQ;
  30.     pQ.push({f[s],s});
  31.     while(pQ.size())
  32.     {
  33.         pll u=pQ.top();pQ.pop();
  34.         if(u.fi!=f[u.se]) continue;
  35.         for(pii v:eg[u.se]) if(u.fi+v.se<f[v.fi])
  36.         {
  37.             f[v.fi]=u.fi+v.se;
  38.             pQ.push({f[v.fi],v.fi});
  39.         }
  40.     }
  41. }
  42. int main()
  43. {
  44.     cin>>n>>m>>k;
  45.     for(int i=1;i<=m;i++)
  46.     {
  47.         int u,v,c;cin>>u>>v>>c;
  48.         eg[u].pb({v,c});//eg[v].pb({u,c});
  49.     }
  50.     dijkstra(1,d[0]);dijkstra(n,d[1]);
  51.     while(k--)
  52.     {
  53.         ll a,b,ans=inf;cin>>a>>b;
  54.         for(int i=1;i<=n;i++)
  55.             if(d[0][i]!=inf && d[1][i]!=inf)
  56.                 ans=min(ans,d[0][i]*a+d[1][i]*b);
  57.         cout<<ans<<'\n';
  58.     }
  59. }
  60.  
Success #stdin #stdout 0.01s 5908KB
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https://ideone.com/1gITgj
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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