Submission #59228

#	Time	Username	Problem	Language	Result	Execution time	Memory
59228		gusfring	Factories (JOI14_factories)	C++14	33 / 100	8083 ms	518552 KiB

factories

#include "factories.h"
#include "bits/stdc++.h"
using namespace std;
typedef pair <int, int> pii;
const int logn = 25;
int sub[500010];
long long dp[logn][500010];
 
int deg[500010];
long long dis[500010];
vector <pii> g[500010];
bool vis[500010];
 
int anc[500010];
long long aux[500010];
const long long inf = 1e16;
 
void subtree(int x, int par) {
	sub[x] = 1;
	for(auto i : g[x]) {
		if(i.first != par && vis[i.first] == false) {
			subtree(i.first, x);
			sub[x] += sub[i.first];
		}
	}
}
int centroid(int x, int par, int range) {
	for(auto i : g[x]) {
		if(i.first != par && vis[i.first] == false) {
			if(sub[i.first] > range) return centroid(i.first, x, range); 
		}
	}
	return x;
}
 
void dfs(int x, int par, int level) {
	assert(level < logn);
	dp[level][x] = dis[x];
	for(auto i : g[x]) {
		if(i.first != par && vis[i.first] == false) {
			dis[i.first] = i.second + dis[x];
			dfs(i.first, x, level);
		}
	}
}
 
void create(int x, int par, int level) {
	subtree(x, -1);
	int c = centroid(x, -1, sub[x] >> 1);
 	dis[c] = 0;
	dfs(c, -1, level);
	deg[c] = level;
	vis[c] = true;
	anc[c] = par;
	for(auto i : g[c]) {
		if(vis[i.first] == false) {	
			create(i.first, c, level + 1);
		}
	}
}
void put(int x) {
	int cur = x;
	int lev = deg[x];
	while(cur >= 0) {
		aux[cur] = min(aux[cur], dp[lev][x]);
		cur = anc[cur];
		--lev;
	}
}
void remove(int x) {
	int cur = x;
	while(cur >= 0) {
		aux[cur] = inf;
		cur = anc[cur];
	} 
}
long long get(int x) {
	int cur = x;
	long long ans = inf;
	int lev = deg[x];
	while(cur >= 0) {
		ans = min(ans, dp[lev][x] + aux[cur]);
		cur = anc[cur];
		--lev;
	}
	return ans;
}
 
void Init(int N, int A[], int B[], int D[]) {
	for(int i = 0; i < N-1; i++) {
		g[A[i]].push_back(pii(B[i], D[i]));
		g[B[i]].push_back(pii(A[i], D[i]));
	}
	create(0, -1, 0);
	for(int i = 0; i < N; i++) {
		aux[i] = inf;
	}
}
long long Query(int S, int X[], int T, int Y[]) {
	for(int i = 0; i < S; i++) {
		put(X[i]);
	}
	long long ans = inf;
	for(int i = 0; i < T; i++) {
		ans = min(ans, get(Y[i]));
	}
	for(int i = 0; i < S; i++) {
		remove(X[i]);
	}
	return ans;
}

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