Submission #656892

#	Time	Username	Problem	Language	Result	Execution time	Memory
656892		anhduc2701	Factories (JOI14_factories)	C++17	15 / 100	8082 ms	398412 KiB

factories

#include<bits/stdc++.h>
#include "factories.h"
using namespace std;
typedef long long ll;
const ll INF=1e18;
const int maxn=1e6+5;
const int mod=1e9+7;
const int mo=998244353;
using pi=pair<ll,ll>;
using vi=vector<ll>;
using pii=pair<pair<ll,ll>,ll>;
#define all(x) x.begin(), x.end()
#define len(x) ll(x.size())
#define eb emplace_back
#define PI 3.14159265359
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define MIN(v) *min_element(all(v))
#define MAX(v) *max_element(all(v))
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int n;
set<pair<int,int>>G[500005];
int sz[500005];
int pa[500005];
map<int,long long>dis[500005];
long long ans[500005];
int dfsz(int u, int p) {
    sz[u] = 1;
    for(auto v : G[u]) if(v.first != p) {
      sz[u] += dfsz(v.first, u);
    }
    return sz[u];
}
int centroid(int u, int p, int n) {
    for(auto v : G[u]) if(v.first != p) {
        if(sz[v.first] > n / 2) return centroid(v.first, u, n);
    }
    return u;
  }
void dfs2(int u, int p, int c, long long d) {
    dis[c][u] = d;
    for(auto v : G[u]) if(v.first != p) {
        dfs2(v.first, u, c, d + (long long)v.second);
    }
}
void build(int u, int p) {
    int n1 = dfsz(u, p);
    int c = centroid(u, p, n1);
    if(p == -1) p = c;
    pa[c] = p;
    dfs2(c, p, c, 0);
    vector<pair<int,int>> tmp(G[c].begin(), G[c].end());
    for(auto v : tmp) {
        G[c].erase({v.first,v.second});
        G[v.first].erase({c,v.second});
        build(v.first, c);
    }
}
void upd(int u){
    int v=u;
    while(v!=0){
        ans[v]=min(ans[v],dis[v][u]);
        v=pa[v];
    }
}
void upd1(int u){
    int v=u;
    while(v!=0){
        ans[v]=INF;
        v=pa[v];
    }
}
long long query(int u) {
    long long mi = INF;
    int v=u;
     while(v!=0){
        mi=min(ans[v]+dis[v][u],mi);
        v=pa[v];
    }
    return mi;
}
void Init(int N,int A[],int B[],int D[]){
	n=N;
	for(int i=0;i<N-1;i++){
		G[A[i]+1].insert({B[i]+1,D[i]});
		G[B[i]+1].insert({A[i]+1,D[i]});
	}
	build(1,0);
	for(int i=1;i<=n;i++){
        ans[i]=INF;
	}
}
long long Query(int S,int X[],int T,int Y[]){
	for(int i=0;i<S;i++){
		upd(X[i]+1);
	}
	long long an=INF;
	for(int i=0;i<T;i++){
		an=min(an,query(Y[i]+1));
	}
	for(int i=0;i<S;i++){
        upd1(X[i]+1);
	}
	return an;
}

• Subtask 1: 15 / 15
• Subtask 2: 0 / 18
• Subtask 3: 0 / 67