Submission #734032

#	Time	Username	Problem	Language	Result	Execution time	Memory
734032		PoPularPlusPlus	Factories (JOI14_factories)	C++17	100 / 100	4549 ms	337520 KiB

factories

#include "factories.h"
#include <bits/stdc++.h>
 
using namespace std; 
 
#define ll long long
#define pb(e) push_back(e)
#define mp(a,b) make_pair(a,b)
#define vf first
#define vs second
 
const int N = 500002,L=20;
vector<pair<int,int>> adj[N];
bool vis[N];
int siz[N],n;
ll res[N];
vector<pair<int,ll>> v[N];

void size_init(int node , int par){
	siz[node] = 1;
	for(auto i : adj[node]){
		if(i.vf != par && !vis[i.vf]){
			size_init(i.vf,node);
			siz[node] += siz[i.vf];
		}
	}
}

int find_centroid(int node , int par , int total){
	for(auto i :  adj[node]){
		if(!vis[i.vf] && i.vf != par && siz[i.vf] >= total/2)return find_centroid(i.vf , node , total);
	}
	return node;
}

void pre_dfs(int node , int par , int root , ll distance){
	v[node].pb(mp(root,distance));
	for(auto i : adj[node]){
		if(!vis[i.vf] && i.vf != par){
			pre_dfs(i.vf , node , root , distance + i.vs);
		}
	}
}

void centroid_decomposition(int node ,int par){
	size_init(node , node);
	node = find_centroid(node , node , siz[node]);
	pre_dfs(node , node , node , 0);
	vis[node] = 1;
	for(auto i : adj[node]){
		if(!vis[i.vf]){
			centroid_decomposition(i.vf , node);
		}
	}
}
 
void Init(int nn, int A[], int B[], int D[]) {
	n = nn;
	for(int i = 0; i < n-1; i++){
		adj[A[i]].pb(mp(B[i],D[i]));
		adj[B[i]].pb(mp(A[i],D[i]));
	}
	memset(vis,0,sizeof vis);
	centroid_decomposition(0,-1);
	memset(res,-1,sizeof res);
}

long long Query(int a, int X[], int b, int Y[]) {
	ll ans = 1e18;
	for(int i = 0; i < a; i++){
		for(auto it : v[X[i]]){
			if(res[it.vf] == -1)res[it.vf] = it.vs;
			else res[it.vf] = min(res[it.vf] , it.vs);
		}
	}
		for(int i = 0; i < b; i++){
			for(auto it : v[Y[i]]){
				if(res[it.vf] != -1){
					ans = min(ans , res[it.vf] + it.vs);
				}
			}
		}
		for(int i = 0; i < a; i++){
			for(auto it : v[X[i]]){
				res[it.vf] = -1;
			}
		}
		return ans;
}

• Subtask 1: 15 / 15
• Subtask 2: 18 / 18
• Subtask 3: 67 / 67