Submission #930954

#	Time	Username	Problem	Language	Result	Execution time	Memory
930954		idiotcomputer	공장들 (JOI14_factories)	C++11	100 / 100	4045 ms	377432 KiB

factories

#include <bits/stdc++.h>
#include "factories.h"
using namespace std;
#define pb push_back
#define ll long long int 
#define pii pair<int,ll>
#define f first 
#define s second 

const int mxN = 5*1e5;
const ll llmax = (ll) 1e17;

vector<pii> adj[mxN];
vector<pii> ctree[mxN];

int ssize[mxN];
ll res[mxN];
bool vis[mxN];

void dfs(int node, int p){
    ssize[node] = 1;
    for (pii next : adj[node]){
        if (next.f == p || vis[next.f]){
            continue;
        }
        dfs(next.f,node);
        ssize[node] += ssize[next.f];
    }
}

void dfs2(int node, int p, int cent, ll cdepth){
    ctree[node].pb({cent,cdepth});
    for (pii next : adj[node]){
        if (next.f == p || vis[next.f]){
            continue;
        }
        dfs2(next.f,node,cent,cdepth+next.s);
    }
}

int gcentroid(int node, int p, int tot){
    for (pii next : adj[node]){
        if (next.f == p || vis[next.f]){
            continue;
        }
        if (ssize[next.f] > tot){
            return gcentroid(next.f,node,tot);
        }
    }
    return node;
}

void cdecomp(int node){
    dfs(node,-1);
    int centroid = gcentroid(node,-1,ssize[node]/2);
    dfs2(centroid,-1,centroid,0);
    vis[centroid] = 1;
    for (pii next : adj[centroid]){
        if (!vis[next.f]){
            cdecomp(next.f);
        }
    }
}

void upd(int node, bool w){
    for (pii next : ctree[node]){
        if (w){
            res[next.f] = min(res[next.f],next.s);
        } else {
            res[next.f] = llmax;
        }
    }
}

ll query(int node){
    ll tot = llmax;
    for (pii next : ctree[node]){
        tot = min(tot, next.s + res[next.f]);
    }
    return tot;
}

void Init(int N, int A[], int B[], int D[]){
    for (int i =0; i < N-1; i++){
        adj[A[i]].pb({B[i],D[i]});
        adj[B[i]].pb({A[i],D[i]});
    }
    memset(vis,0,sizeof(vis));
    cdecomp(0);
    for (int i = 0; i < N; i++){
        res[i] = llmax;
    }
}

long long Query(int S, int X[], int T, int Y[]){
    vector<int> temp;
    ll tot = llmax;
    for (int i = 0; i < S; i++){
        upd(X[i],true);
        temp.pb(X[i]);
    }
    for (int i = 0; i < T; i++){
        tot = min(tot, query(Y[i]));
    }
    for (int i =0; i < S; i++){
        upd(temp[i],false);
    }
    return tot;
}
/*
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    
    int n,q;
    cin >> n >> q;
    
    int a,b,d;
    for (int i =0; i < n-1; i++){
        cin >> a >> b >> d;
        adj[a].pb({b,d});
        adj[b].pb({a,d});
    }
   
    memset(vis,0,sizeof(vis));
    cdecomp(0);
    for (int i = 0; i < n; i++){
        res[i] = llmax;
    }

    int s,t;
    ll tot;
    vector<int> temp;
    for (int i =0; i < q; i++){
        cin >> s >> t;
        tot = llmax;
        temp.clear();
        for (int j = 0; j < s; j++){
            cin >> a;
            upd(a,true);
            temp.pb(a);
        }
        for (int j = 0; j < t; j++){
            cin >> a;
            tot = min(tot, query(a));
        }
        for (int j =0; j < s; j++){
            upd(temp[j],false);
        }
        cout << tot << '\n';
    }
    
    
    return 0;
}*/

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