Submission #1227980

#	Time	Username	Problem	Language	Result	Execution time	Memory
1227980		pera	Cyberland (APIO23_cyberland)	C++20	15 / 100	27 ms	21316 KiB

cyberland

#include "cyberland.h"
#include <bits/stdc++.h>
#define LL long long
using namespace std;

double solve(int N, int M, int K, int H, std::vector<int> x, std::vector<int> y, std::vector<int> c, std::vector<int> arr) {
   vector<vector<pair<int , int>>> g(N);
   for(int i = 0;i < M;i ++){
      g[x[i]].emplace_back(y[i] , c[i]);
      g[y[i]].emplace_back(x[i] , c[i]);
   }
   K = min(K , 30);
   vector<vector<LL>> dist(N , vector<LL>(K + 1 , -1));
   priority_queue<tuple<LL , int , int> , vector<tuple<LL , int , int>> , greater<tuple<LL , int , int>>> pq;
   dist[H][0] = 0;
   pq.push(tuple<LL , int , int>{0 , H , 0});
   while(!pq.empty()){
      auto [D , u , x] = pq.top();
      pq.pop();
      for(auto [v , w] : g[u]){
         LL nD = D + w;
         if(dist[v][x] == -1 || dist[v][x] > nD){
            dist[v][x] = nD;
            pq.push(tuple<LL , int , int>{dist[v][x] , v , x});
         }
         if(arr[v] == 2 && x < K && (dist[v][x + 1] == -1 || dist[v][x + 1] > nD)){
            dist[v][x + 1] = nD;
            pq.push(tuple<LL , int , int>{dist[v][x + 1] , v , x});
         }
      }
   }
   LL ans = -1 , p = 0;
   for(int i = 0;i < N;i ++){
      if(i == 0 || arr[i] == 0){
         for(int x = 0;x <= K;x ++){
            if(dist[i][x] != -1){
               if(ans == -1){
                  ans = dist[i][x];
                  p = x;
                  continue;
               }
               LL left = ans * (1LL << x);
               LL right = dist[i][x] * (1LL << p);
               if(right < left){
                  ans = dist[i][x];
                  p = x;
               }
            }
         }
      }
   }
   if(ans == -1){
      return ans;
   }
   long double S = ans;
   for(int i = 0;i < p;i ++){
      S /= 2.0;
   }
   return (double)S;
}

• Subtask 1: 0 / 5
• Subtask 2: 8 / 8
• Subtask 3: 0 / 13
• Subtask 4: 0 / 19
• Subtask 5: 7 / 7
• Subtask 6: 0 / 16
• Subtask 7: 0 / 29
• Subtask 8: 0 / 3