Submission #954116

#	Time	Username	Problem	Language	Result	Execution time	Memory
954116		Otalp	Cyberland (APIO23_cyberland)	C++17	100 / 100	2735 ms	142164 KiB

cyberland

#include "cyberland.h"
#include <bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
#define pb push_back
#define ff first
#define ss second


vector<pair<int, int>> q[200100];
double dp[200100][105];
int us[200100][105];
int pos[200100];
int H;

void dfs(int v){
  pos[v] = 1;
  if(v == H) return;
  for(int i=0; i<q[v].size(); i++){
    int to = q[v][i].ff;
    if(pos[to]) continue;
    dfs(to);
  }
}

double st[200];


double solve(int n, int m, int K, int h, vector<int> x, vector<int> y, vector<int> c, vector<int> arr) {
  H = h;
  int k = min(K, 44);
  for(int i=0; i<n; i++){
    q[i].clear();
    for(int j=0; j<=k; j++){
      dp[i][j] = us[i][j] = 0;
    }
    pos[i] = 0;
  }
  for(int i=0; i<m; i++){
    q[x[i]].pb({y[i], c[i]});
    q[y[i]].pb({x[i], c[i]});
  }
  st[0]= 1;
  for(int i=1; i<=k + 2; i++){
    st[i] = st[i - 1] / 2;
  }

  dfs(0);

  if(pos[h] == 0) return -1; 
  set<pair<pair<int, double>, int>> s;
  s.insert({{0, 0}, h});

  while(s.size()){
    auto it = s.begin();
    if(us[it -> ss][it -> ff.ff]){
      s.erase(it);
      continue;
    }
    int v = it -> ss;
    int c = it -> ff.ff;
    us[v][c] = 1;
    dp[v][c] = it -> ff.ss;
    s.erase(it);
    for(int i=0; i<q[v].size(); i++){
      int to = q[v][i].ff;
      int x = q[v][i].ss;
      if(!us[to][c] and to != h){
        s.insert({{c, dp[v][c] + x * st[c]}, to});
      }
      if(arr[to] == 2 and c + 1 <= k and !us[to][c+1] and to != h){
        s.insert({{c + 1, dp[v][c] + x * st[c]}, to});
      }
    }
  }
  double mn=1e18;
  if(k < K){
    for(int i=0; i<n; i++){
      if(us[i][k] and pos[i]) mn = min(mn, dp[i][k]);
    }
  }
  arr[0] = 0;
  for(int i=0; i<n; i++){
    if(pos[i] and arr[i] == 0){
      for(int j=0; j<=k; j++){
        if(us[i][j]) mn = min(mn, dp[i][j]);
      }
    }
  }
  if(mn == 1e18) return -1;
  return mn;
}

Compilation message (stderr)

cyberland.cpp: In function 'void dfs(int)':
cyberland.cpp:19:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |   for(int i=0; i<q[v].size(); i++){
      |                ~^~~~~~~~~~~~
cyberland.cpp: In function 'double solve(int, int, int, int, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
cyberland.cpp:65:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |     for(int i=0; i<q[v].size(); i++){
      |                  ~^~~~~~~~~~~~

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