Submission #937664

#	Time	Username	Problem	Language	Result	Execution time	Memory
937664		Baytoro	Cyberland (APIO23_cyberland)	C++17	97 / 100	1976 ms	95944 KiB

cyberland

#include "cyberland.h"
#include <bits/stdc++.h>
//#include "stub.cpp"

using namespace std;

#define ll long long
//#define int ll
#define pb push_back

#define tt pair<long double,pair<int,int>>
#define fr first
#define sc second.first
#define tr second.second

const ll N1=1e5+5,INF=1e18;
long double dist[N1][33];
vector<pair<int,int>> g[N1];
int a[N1];
int used[N1];
void djks(int x, int h, int n){
	priority_queue<tt,vector<tt>,greater<tt>> pq;
	for(int i=0;i<n;i++){
		if(used[i] && (i==0 || a[i]==0)){
			pq.push({0,{i,0}});
			dist[i][0]=0;
		}
	}
	while(!pq.empty()){
		tt tmp=pq.top();
		pq.pop();
		int cur=tmp.sc,t=tmp.tr;
		if(cur==h) continue;
		if(abs(dist[cur][t]-tmp.fr)>1e-9) continue;
		for(auto it: g[cur]){
			if(dist[it.first][t]>dist[cur][t]+it.second){
				dist[it.first][t]=dist[cur][t]+it.second;
				pq.push({dist[it.first][t],{it.first,t}});
			}
			if(t==30) continue;
			if(a[it.first]==2){
				if(dist[it.first][t+1]>(dist[cur][t]+it.second)/2){
					dist[it.first][t+1]=(dist[cur][t]+it.second)/2;
					pq.push({dist[it.first][t+1],{it.first,t+1}});
				}
			}
		}
	}
}
void dfs(int x, int h){
	
	used[x]=1;
	if(x==h) return;
	for(auto it: g[x]){
		if(!used[it.first]) 
			dfs(it.first,h);
	}
}
double solve(int n, int M, int K, int H, vector<int> x, vector<int> y, vector<int> c, vector<int> arr) {
	for(int i=0;i<n;i++){
		for(int j=0;j<=31;j++)
			dist[i][j]=INF;
		g[i].clear();
		used[i]=0;
	}
	for(int i=0;i<M;i++){
		g[x[i]].pb({y[i],c[i]});
		g[y[i]].pb({x[i],c[i]});
	}
	for(int i=0;i<n;i++)
		a[i]=arr[i];
	dfs(0,H);
	if(!used[H]) return -1;
	djks(0,H,n);
	long double ans=INF;
	for(int i=0;i<=K;i++){
		ans=min(ans,dist[H][i]);
	}
	if(ans==INF) return -1;
	else return ans;
}

• 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: 0 / 3