Submission #1205209

#	Time	Username	Problem	Language	Result	Execution time	Memory
1205209		loom	Hotspot (NOI17_hotspot)	C++20	100 / 100	1022 ms	245500 KiB

hotspot

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ld long double
#define inf 5e18
#define nl '\n'

inline void solve(){
   int n, m;
   cin>>n>>m;
   vector<int> g[n];
   for(int i=0; i<m; i++){
      int a, b;
      cin>>a>>b;
      g[a].push_back(b);
      g[b].push_back(a);
   }

   int k;
   cin>>k;
   vector<pair<int,int>> v(k);
   for(auto &[a, b] : v) cin>>a>>b;

   int d[n][n], c[n][n];
   for(int i=0; i<n; i++){
      queue<int> q;
      auto &dist = d[i];
      auto &cnt = c[i];
      vector<int> vis(n, 0);

      q.push(i);
      dist[i] = 0;
      cnt[i] = 1;
      vis[i] = 1;

      while(!q.empty()){
         int v = q.front();
         q.pop();

         for(int ch : g[v]){
            if(!vis[ch]){
               vis[ch] = 1;
               dist[ch] = dist[v]+1;
               cnt[ch] = cnt[v];
               q.push(ch);
            }
            else if(dist[v]+1 == dist[ch]){
               cnt[ch] += cnt[v];
            }
         }
      }
   }

   int ans = 0;
   ld mx = 0;

   for(int i=0; i<n; i++){
      ld sum = 0;
      for(auto [a, b] : v){
         if(d[a][i] + d[i][b] == d[a][b]) sum += (ld)(c[a][i] * c[i][b])/c[a][b];
      }

      if(sum > mx){
         mx = sum;
         ans = i;
      }
   }

   cout<<ans;
}

signed main(){
   ios_base::sync_with_stdio(0);
   cin.tie(NULL);cout.tie(NULL);

   int t = 1;
   //cin>>t;
   while(t--) solve();

   return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 11 / 11
• Subtask 4: 18 / 18
• Subtask 5: 26 / 26
• Subtask 6: 36 / 36