Submission #951245

#	Time	Username	Problem	Language	Result	Execution time	Memory
951245		NourWael	Relay Marathon (NOI20_relaymarathon)	C++17	0 / 100	2 ms	2396 KiB

RelayMarathon

#include <bits/stdc++.h>
#define int long long
using namespace std; 
int const mxN = 1e3+5;
vector<pair<int,int>> adj[mxN];
vector<int> spe;
bool is[mxN], vis[mxN];
int dist[mxN][mxN], cur[mxN];
int n; 

void solve ( int i , int e1, int e2, bool f) {

   memset(vis,0,sizeof vis);
   for(int j=1; j<=n; j++) cur[j] = 1e18;
   priority_queue<pair<int,int>> q;
   q.push({0,i});
   
   while(q.size()) {
     int node = q.top().second, d = -(q.top().first);
     q.pop();
     if(vis[node]) continue;
     vis[node] = 1;
     for(auto it:adj[node]) {
      if(cur[it.first]<=d+it.second) continue;
      cur[it.first] = d+it.second;
      q.push({-(d+it.second), it.first});
     }
   }

   for(int j=1; j<=n; j++) dist[i][j] = cur[j];
}
signed main() {
  
  ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
 
   int m,k; cin>>n>>m>>k;
   for(int i=0; i<m; i++) {
      int x,y,c; cin>>x>>y>>c;
      adj[x].push_back({y,c}), adj[y].push_back({x,c});
   }
   
   for(int i=1; i<=n; i++) for(int j=1; j<=n; j++) dist[i][j] = 1e18; 
   for(int i=0; i<k; i++) {
      int x; cin>>x;
      is[x] = 1;
      spe.push_back(x);
   }
   
   for(int i=1; i<=n; i++) solve(i, 0, 0, 0);
    
   int ans = 1e18;

   for(int i=1; i<=n; i++) {
      if(!is[i]) continue;
      for(int j=1; j<=n; j++) {
         if(!is[j] || j==i) continue;
         for(int h=1; h<=n; h++) {
            if(!is[h] || h==i || h==j) continue;
            for(int l=1; l<=n; l++) {
              if(!is[l] || l==i || l==j || l==h) continue;
              if(dist[i][j] + dist[h][l]<ans) { cout<<i<<' '<<j<<' '<<h<<' '<<l<<'\n'; ans = dist[i][j] + dist[h][l];}
            }
         }
      }
   }

   cout<<ans;
   return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 12
• Subtask 3: 0 / 25
• Subtask 4: 0 / 58