제출 #780181

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
780181		vjudge1	공장들 (JOI14_factories)	C++17	100 / 100	4488 ms	160152 KiB

factories

#include <bits/stdc++.h>
using namespace std;
 
#include "factories.h"
 
#define ll long long
#define pii pair <int, int>
#define pil pair <int, ll>
#define fi first
#define se second
#define mp make_pair
 
const int NM = 5e5, LOG = 18;
const ll inf = 1e18;
 
int N, Q;
vector <pii> adj[NM+5];
int parent[NM+5], h[NM+5], jump[NM+5][LOG+5];
ll d[NM+5];
int t, s[NM+5], e[NM+5];
vector <int> L, L1;
int col[NM+5];
stack <int> st;
vector <pil> son[NM+5];
ll dp1[NM+5], dp2[NM+5], ans;
 
void DFS(int u){
	s[u] = ++t;
	for (int i = 0; i < (int)adj[u].size(); i++){
		int v = adj[u][i].fi;
		if (h[v] != -1) continue;
		parent[v] = u;
		h[v] = h[u]+1;
		d[v] = d[u]+(ll)adj[u][i].se;
		DFS(v);
	}
	e[u] = t;
}
 
void build(){
	for (int i = 0; i < N; i++)
		jump[i][0] = parent[i];
	for (int j = 1; j <= LOG; j++)
		for (int i = 0; i < N; i++)
			if (jump[i][j-1] != -1) jump[i][j] = jump[jump[i][j-1]][j-1];	
			else jump[i][j] = -1;
}
 
bool is_ancestor(int a, int u){
	return s[a] <= s[u] && e[a] >= e[u];
}
 
int LCA(int u, int v){
	if (h[u] < h[v]) swap(u, v);
	for (int i = LOG; i >= 0; i--)
		if (h[u]-(1<<i) >= h[v]) u = jump[u][i];
	if (u == v) return u;
	for (int i = LOG; i >= 0; i--)
		if (jump[u][i] != -1 && jump[u][i] != jump[v][i]){
			u = jump[u][i];
			v = jump[v][i];
		}
	return parent[u];
}
 
ll dist(int u, int v){
	return d[u]+d[v]-2*d[LCA(u, v)];
}
 
bool cmp(int x, int y){
	return s[x] < s[y];
}
 
void DFS2(int u){
	dp1[u] = +inf, dp2[u] = +inf;
	for (int i = 0; i < (int)son[u].size(); i++){
		int v = son[u][i].fi;
		DFS2(v);
		ans = min(ans, dp1[u]+dp2[v]+son[u][i].se);
		ans = min(ans, dp2[u]+dp1[v]+son[u][i].se);
		dp1[u] = min(dp1[u], dp1[v]+son[u][i].se);
		dp2[u] = min(dp2[u], dp2[v]+son[u][i].se);
	}
	if (col[u] == 1){
		dp1[u] = 0;
		ans = min(ans, dp2[u]);
	}
	if (col[u] == 2){
		dp2[u] = 0;
		ans = min(ans, dp1[u]);
	}
}
 
void Init(int n, int A[], int B[], int D[]){
	N = n;
	for (int i = 0; i < N; i++) adj[i].clear();
	for (int i = 0; i < N-1; i++){
		adj[A[i]].push_back(mp(B[i], D[i]));
		adj[B[i]].push_back(mp(A[i], D[i]));
	}
	parent[0] = -1, h[0] = 0, d[0] = 0;
	for (int i = 1; i < N; i++) h[i] = -1;
	t = 0;
	DFS(0);
	build();
	memset(col, 0, sizeof(col));
}
 
ll Query(int S, int X[], int T, int Y[]){
	L.clear();
	for (int i = 0; i < S; i++){
		col[X[i]] = 1;
		L.push_back(X[i]);
	}
	for (int i = 0; i < T; i++){
		col[Y[i]] = 2;
		L.push_back(Y[i]);
	}
	sort(L.begin(), L.end(), cmp);
	L1.clear();
	for (int i = 0; i < (int)L.size(); i++){
		L1.push_back(L[i]);
		if (i+1 < (int)L.size()){
			int tmp = LCA(L[i], L[i+1]);
			if (col[tmp] == 0){
				col[tmp] = 3;
				L1.push_back(tmp);
			}
		}
	}
/*	if (col[0] == 0){
		col[0] = 3;
		L1.push_back(0);
	}*/
	sort(L1.begin(), L1.end(), cmp);
	for (int i = 0; i < (int)L1.size(); i++) son[L1[i]].clear();
	while (!st.empty()) st.pop();
	for (int i = 0; i < L1.size(); i++){
		while (!st.empty() && !is_ancestor(st.top(), L1[i])) st.pop();
		if (st.empty()){
			st.push(L1[i]);
		}
		else{
			son[st.top()].push_back(mp(L1[i], dist(st.top(), L1[i])));
			st.push(L1[i]);
		}
	}
	ans = +inf;
	DFS2(L1[0]);
	for (int i = 0; i < (int)L1.size(); i++) col[L1[i]] = 0;
	return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

factories.cpp: In function 'long long int Query(int, int*, int, int*)':
factories.cpp:138:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  138 |  for (int i = 0; i < L1.size(); i++){
      |                  ~~^~~~~~~~~~~

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