Submission #101049

#	Time	Username	Problem	Language	Result	Execution time	Memory
101049		arman_ferdous	Factories (JOI14_factories)	C++17	15 / 100	8105 ms	101536 KiB

factories

#include "factories.h"
#include <bits/stdc++.h>
using namespace std;
 
using ll = long long;
const int N = 5e5+10;
const ll INF = 1e18;
 
int n;
vector< pair<int,int> > g[N];
 
int par[N][19]; ll lev[N], dep[N];
void lcadfs(int u, int f, ll l, int d) {
	lev[u] = l;
	dep[u] = d;
	par[u][0] = f;
	for(auto it : g[u]) if(it.first != f)
		lcadfs(it.first, u, l + it.second, d + 1);
}
int lca(int u, int v) {
	if(dep[u] > dep[v]) swap(u,v);
	for(int j = 18; j >= 0; j--)
		if(dep[v] - (1<<j) >= dep[u]) 
			v = par[v][j];
	if(u == v) return u;
	for(int j = 18; j >= 0; j--) 
		if(par[u][j] != par[v][j])
			u = par[u][j], v = par[v][j];
	return par[u][0];
}
ll dist(int u, int v) {
	return lev[u] + lev[v] - 2ll*lev[lca(u,v)];
}
 
int Deleted[N], sub[N], head[N];
int subdfs(int u, int f) {
	sub[u] = 1;
	for(auto it : g[u]) if(it.first != f && !Deleted[it.first])
		sub[u] += subdfs(it.first, u);
	return sub[u];
}
int get_centroid(int u, int f, int lim) {
	for(auto it : g[u]) if(it.first != f && !Deleted[it.first]) 
		if(2 * sub[it.first] > lim) return get_centroid(it.first, u, lim);
	return u;
}
void decompose(int s, int dad) {
	subdfs(s,-1);
	int u = get_centroid(s, -1, sub[s]);
	head[u] = dad;
	Deleted[u] = 1;
	for(auto it : g[u]) if(!Deleted[it.first])
		decompose(it.first, u);
}
 
ll mnDist[N]; int deNode[N];
void Init(int n_, int A[], int B[], int D[]) {
	n = n_;
	for(int i = 0; i < n-1; i++) {
		g[A[i]].push_back({B[i], D[i]});
		g[B[i]].push_back({A[i], D[i]});
	}
	memset(par,-1,sizeof par);
	lcadfs(0,-1,0,0);
	for(int j = 1; j < 19; j++)
		for(int i = 0; i < n; i++)
			if(par[i][j-1] + 1)
				par[i][j] = par[par[i][j-1]][j-1];
	decompose(0,-1);
	for(int i = 0; i < n; i++)
		mnDist[i] = INF, deNode[i] = -1;
}
 
void add(int u) {
	for(int p = u; p + 1; p = head[p]) {
		ll d = dist(u, p);
		if(d < mnDist[p]) mnDist[p] = d, deNode[p] = u;
	}
}
void remove(int u) {
	for(int p = u; p + 1; p = head[p])
		mnDist[p] = INF, deNode[p] = -1;
}
ll get(int u) {
	ll ret = INF;
	for(int p = u; p + 1; p = head[p]) if(deNode[p] + 1)
		ret = min(ret, dist(u, deNode[p]));
	return ret;
}
 
ll Query(int S, int X[], int T, int Y[]) {
	for(int i = 0; i < S; i++) add(X[i]);
	ll ret = INF;
	for(int i = 0; i < T; i++)
		ret = min(ret, get(Y[i]));
	for(int i = 0; i < S; i++) remove(X[i]);
  	return ret;
}

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