Submission #1194823

#	Time	Username	Problem	Language	Result	Execution time	Memory
1194823		dzuizz	Cyberland (APIO23_cyberland)	C++20	0 / 100	3098 ms	61092 KiB

cyberland

#include "cyberland.h"
#include <bits/stdc++.h>
using namespace std;
constexpr int N=1e5+5,K=50;
int n,m,k,h;
vector<int> arr;
vector<pair<int,int>> g[N];
int min_nx[N];
double di[N][K];
bool vi[N];
priority_queue<pair<double,pair<int,int>>> pq;  // (-d,i,j)
void find0(int u){
  if(arr[u]==0)
    pq.emplace(0.0,make_pair(u,0)),di[u][0]=0;
  vi[u]=1;
  for(auto&[w,v]:g[u]) if(!vi[v]&&v!=h)
    find0(v);
}
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) {
  n=_n,m=_m,k=min(_k,49),h=_h,arr=_arr;
  for(int i=0;i<m;++i)
    g[x[i]].emplace_back(c[i],y[i]),
    g[y[i]].emplace_back(c[i],x[i]);
  fill(min_nx,min_nx+n,1e9);
  for(int i=0;i<n;++i) for(auto&[w,j]:g[i])
    if(j!=h) min_nx[i]=min(min_nx[i],w);
  memset(vi,0,sizeof vi);
  for(auto&v:di) for(auto&x:v) x=1e9;
  pq.emplace(0.0,make_pair(0,0)); di[0][0]=0.0;
  find0(0);
  while(pq.size()){
    auto [d,p]=pq.top(); pq.pop();
    int i=p.first,j=p.second; d=-d;
    cerr<<d<<" "<<di[i][j]<<" "<<i<<" "<<j<<'\n';
    if(i==h) continue;
    if(d<di[i][j]) continue;
    for(auto&[w,x]:g[i]){
      cerr<<">> "<<x<<" "<<arr[x]<<'\n';
      if(arr[x]==0) continue;
      else if(arr[x]==1){
        double nd=d+(double)w;
        if(nd<di[x][j]) pq.emplace(-(di[x][j]=nd),make_pair(x,j));
      }else{  // arr[v]==2
        if(d+w<di[x][j]) pq.emplace(-(di[x][j]=d+w),make_pair(x,j));
        double nd=d/2;
        for(int l=j+1;l<=k;++l){
          if(nd+w<di[x][l]) pq.emplace(-(di[x][l]=nd+w),make_pair(x,l));
          nd=nd/2+min_nx[x];
        }
      }
    }
  }
  double ans=1e9;
  for(int j=0;j<k;++j){
    ans=min(ans,di[h][j]);
  }
  return ans;
}

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