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답안 #682766

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
682766 2023-01-17T01:29:47 Z NK_ 공장들 (JOI14_factories) C++17
100 / 100
 3841 ms 204792 KB 
// Success consists of going from failure to failure without loss of enthusiasm
#include <bits/stdc++.h>
#include "factories.h"
 
using namespace std;
 
#define nl '\n'
 
using ll = long long;
using E = array<int, 2>;
 
const int nax = 5e5+5;
const int LG = 20;
vector<E> adj[nax];
bool vis[nax];
int up[nax][LG];
ll DST[nax][LG];
int par[nax], siz[nax], dep[nax];
ll dx[nax], dy[nax], dst[nax];
 
 
const ll INFL = ll(1e18) + 10;
 
// START OF LCA
 
void dfs(int u = 0, int p = -1) {
	up[u][0] = (p == -1 ? u : p);
	for(int i = 1; i < LG; i++) up[u][i] = up[up[u][i-1]][i-1];
 
	for(auto e : adj[u]) if (e[0] != p) {
		int v = e[0], w = e[1];
		dst[v] = dst[u] + w;
		dep[v] = dep[u] + 1;
		dfs(v, u);
	}
 
}
 
int jmp(int u, int d) {
	for(int i = 0; i < LG; i++) if ((d>>i) & 1) u = up[u][i];
	return u;
}
 
int lca(int a, int b) {
	if (dep[a] > dep[b]) swap(a, b);
	b = jmp(b, dep[b] - dep[a]); if (a == b) return a;
 
	for(int i = LG - 1; i >= 0; i--) if (up[a][i] != up[b][i]) a = up[a][i], b = up[b][i];
		
	return up[a][0];
}
 
ll dist(int u, int v) {
	return dst[u] + dst[v] - 2LL * dst[lca(u, v)];
}
 
// END OF LCA
 
// START OF CENTROID DECOMPOSITION
int find_size(int u, int p = -1) {
	if (vis[u]) return 0;
	siz[u] = 1;
	for(auto e : adj[u]) if (e[0] != p) {
		int v = e[0];
		siz[u] += find_size(v, u);
	}
	return siz[u];
}
 
int find_centroid(int u, int p, int n) {
	for(auto e : adj[u]) if (e[0] != p) {
		int v = e[0];
		if (!vis[v] && siz[v] > n / 2) return find_centroid(v, u, n);
	}
	return u;
}
 
vector<int> anc;
void init_centroid(int u = 0, int p = -1) {
	find_size(u);
 
	int c = find_centroid(u, -1, siz[u]);
	vis[c] = 1;
	par[c] = p;
 
	for(int i = 0; i < int(size(anc)); i++) {
		int J = int(size(anc)) - i;
		// cout << J << " " << anc[i] << " " << dist(c, anc[i]) << endl;
		DST[c][J] = dist(c, anc[i]);
	}
 
	anc.push_back(c);
 
	for(auto e : adj[c]) {
		int v = e[0];
		if (vis[v]) continue;
		init_centroid(v, c);
	}
	anc.pop_back();
}
// END OF CENTROID DECOMPOSITION
 
 
void Init(int N, int A[], int B[], int D[]) {
	for(int i = 0; i < N; i++) {
		vis[i] = 0; par[i] = -1;
		dx[i] = dy[i] = INFL;
		adj[i] = {};
		dst[i] = dep[i] = siz[i] = 0;
 
		for(int j = 0; j < LG; j++) up[i][j] = 0;
	}
 
	for(int i = 0; i < N-1; i++) {
		adj[A[i]].push_back({B[i], D[i]});
		adj[B[i]].push_back({A[i], D[i]});
	}
 
	dfs();
	init_centroid();
}
 
vector<int> alt;
ll Query(int S, int X[], int T, int Y[]) {
	for(int i = 0; i < S; i++) {
		int u = X[i]; 
		dx[u] = 0; alt.push_back(u);
		int jump = 0;
		while(par[u] != -1) {
			u = par[u];
			alt.push_back(u);
			dx[u] = min(dx[u], DST[X[i]][++jump]);
		}
	}

 
	ll ans = INFL;
	for(int i = 0; i < T; i++) {
		int u = Y[i];
		int jump = 0;
		while(u != -1) {
			ans = min(ans, dx[u] + DST[Y[i]][jump++]);
			u = par[u];
		}
	}
 
	for(const auto &u : alt) dx[u] = INFL;
	alt.clear();
 
	return ans;
}

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 12524 KB Output is correct
2 Correct 310 ms 21788 KB Output is correct
3 Correct 286 ms 21616 KB Output is correct
4 Correct 297 ms 22060 KB Output is correct
5 Correct 303 ms 22092 KB Output is correct
6 Correct 199 ms 21708 KB Output is correct
7 Correct 279 ms 21656 KB Output is correct
8 Correct 292 ms 21800 KB Output is correct
9 Correct 309 ms 22140 KB Output is correct
10 Correct 190 ms 21676 KB Output is correct
11 Correct 295 ms 21840 KB Output is correct

Subtask #2
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 12372 KB Output is correct
2 Correct 1557 ms 178976 KB Output is correct
3 Correct 2561 ms 180604 KB Output is correct
4 Correct 695 ms 179780 KB Output is correct
5 Correct 3508 ms 203200 KB Output is correct
6 Correct 2536 ms 181996 KB Output is correct
7 Correct 801 ms 53828 KB Output is correct
8 Correct 332 ms 54572 KB Output is correct
9 Correct 942 ms 57400 KB Output is correct
10 Correct 801 ms 55164 KB Output is correct

Subtask #3
67.0 / 67.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 12524 KB Output is correct
2 Correct 310 ms 21788 KB Output is correct
3 Correct 286 ms 21616 KB Output is correct
4 Correct 297 ms 22060 KB Output is correct
5 Correct 303 ms 22092 KB Output is correct
6 Correct 199 ms 21708 KB Output is correct
7 Correct 279 ms 21656 KB Output is correct
8 Correct 292 ms 21800 KB Output is correct
9 Correct 309 ms 22140 KB Output is correct
10 Correct 190 ms 21676 KB Output is correct
11 Correct 295 ms 21840 KB Output is correct
12 Correct 7 ms 12372 KB Output is correct
13 Correct 1557 ms 178976 KB Output is correct
14 Correct 2561 ms 180604 KB Output is correct
15 Correct 695 ms 179780 KB Output is correct
16 Correct 3508 ms 203200 KB Output is correct
17 Correct 2536 ms 181996 KB Output is correct
18 Correct 801 ms 53828 KB Output is correct
19 Correct 332 ms 54572 KB Output is correct
20 Correct 942 ms 57400 KB Output is correct
21 Correct 801 ms 55164 KB Output is correct
22 Correct 1804 ms 182576 KB Output is correct
23 Correct 1826 ms 186704 KB Output is correct
24 Correct 2894 ms 186740 KB Output is correct
25 Correct 3050 ms 189108 KB Output is correct
26 Correct 3022 ms 182776 KB Output is correct
27 Correct 3841 ms 204792 KB Output is correct
28 Correct 824 ms 184540 KB Output is correct
29 Correct 3030 ms 182348 KB Output is correct
30 Correct 2938 ms 181808 KB Output is correct
31 Correct 2877 ms 182444 KB Output is correct
32 Correct 944 ms 61404 KB Output is correct
33 Correct 358 ms 55848 KB Output is correct
34 Correct 586 ms 52132 KB Output is correct
35 Correct 575 ms 52224 KB Output is correct
36 Correct 742 ms 52612 KB Output is correct
37 Correct 818 ms 52572 KB Output is correct