제출 #65751

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
65751		reality	공장들 (JOI14_factories)	C++17	33 / 100	8026 ms	141068 KiB

factories

#include "factories.h"
#include "bits/stdc++.h"
using namespace std;
#define fi first
#define se second
#define ll long long
#define dbg(v) cerr<<#v<<" = "<<v<<'\n'
#define vi vector<int>
#define vl vector <ll>
#define pii pair<int,int>
#define mp make_pair
#define db long double
#define pb push_back
#define all(s) s.begin(),s.end()
template < class P , class Q > ostream& operator<<(ostream& stream, pair < P , Q > v){ stream << "(" << v.fi << ',' << v.se << ")"; return stream;}
template < class T > ostream& operator<<(ostream& stream, const vector<T> v){ stream << "[ "; for (int i=0; i<(int)v.size(); i++) stream << v[i] << " "; stream << "]"; return stream;}
template < class T > T smin(T &a,T b) {if (a > b) a = b;return a;}
template < class T > T smax(T &a,T b) {if (a < b) a = b;return a;}
 
int n;
 
const int N = 2e6 + 5;
 
vector < pii > g[N];
 
int SZ[N];
 
void dfs_sz(int v = 0) {
	SZ[v] = 1;
	for (auto & u : g[v]) {
		if (SZ[u.fi] != -1)
			continue;
		dfs_sz(u.fi);
		SZ[v] += SZ[u.fi];
		if (SZ[u.fi] > SZ[g[v][0].fi])
			swap(u, g[v][0]);
	}
}
 
int in[N];
 
int out[N];
 
int rin[N];
 
int nxt[N];
 
int pr[N];
 
int Time = 0;
 
ll D[N];
 
void dfs_hld(int v = 0) {
	in[v] = ++Time;
	rin[in[v]] = v;
	for (auto u : g[v]) {
		if (D[u.fi] != -1)
			continue;
		nxt[u.fi] = (u == g[v][0] ? nxt[v] : u.fi);
		D[u.fi] = u.se + D[v];
		pr[u.fi] = v;
		dfs_hld(u.fi);
	}
	out[v] = Time;
}
 
ll t[N];
 
ll T[N];
 
ll lz[N];
 
int ok[N];
 
void upd_lz(int l,int r,int node) {
	if (lz[node] != -1) {
		if (l != r)
			lz[node * 2] = lz[node * 2 + 1] = lz[node];
		T[node] = t[node] + lz[node];
		if (lz[node] == 0)
			ok[node] = 0;
		else
			ok[node] = r - l + 1;
	}
	lz[node] = -1;
}
 
void build(int l,int r,int node) {
	lz[node] = -1;
	if (l == r)
		return void(T[node] = t[node] = -2 * D[rin[l]]);
	int m = (l + r) / 2;
	build(l,m,node * 2);
	build(m+1,r,node * 2 + 1);
	T[node] = t[node] = min(t[node * 2],t[node * 2 + 1]);
}
 
void Upd(int l,int r,int node) {
	if (l == r)
		return;
	int m = (l + r) / 2;
	T[node] = min(T[node * 2],T[node * 2 + 1]);
	ok[node] = ok[node * 2] + ok[node * 2 + 1];
}
 
void update(int l,int r,int l1,int r1,ll v,int node) {
	upd_lz(l,r,node);
	if (l1 <= l && r <= r1)
		lz[node] = v,upd_lz(l,r,node);
	else {
		int m = (l + r) / 2;
		if (l1 <= m)
			update(l,m,l1,r1,v,node * 2);
		else
			upd_lz(l,m,node * 2);
		if (m+1<=r1)
			update(m+1,r,l1,r1,v,node * 2 + 1);
		else
			upd_lz(m+1,r,node * 2 + 1);
		Upd(l,r,node);
	}
}
 
ll query(int l,int r,int l1,int r1,int node) {
	upd_lz(l,r,node);
	if (!ok[node])
		return (ll)(1e18);
	if (l1 <= l && r <= r1 && ok[node] == r - l + 1)
		return T[node];
	int m = (l + r) / 2;
	ll ans = 1e18;
	if (l1 <= m)
		smin(ans,query(l,m,l1,r1,node * 2));
	else
		upd_lz(l,m,node * 2);
	if (m+1<=r1)
		smin(ans,query(m+1,r,l1,r1,node * 2 + 1));
	else
		upd_lz(m+1,r,node * 2 + 1);
	Upd(l,r,node);
	return ans;
}
 
void Init(int NN, int A[], int B[], int DD[]) {
	n = NN;
	for (int i = 0;i < n;++i) {
		g[A[i]].pb(mp(B[i],DD[i]));
		g[B[i]].pb(mp(A[i],DD[i]));
	}
	for (int i = 0;i < n;++i)
		SZ[i] = D[i] = -1;
	D[0] = 0;
	dfs_sz();
	dfs_hld();
	build(1,n,1);
	rin[0] = -1;
	pr[0] = -1;
}
 
void upd(int node,ll v) {
	while (node >= 0) {
		update(1,n,in[nxt[node]],in[node],v,1);
		node = pr[nxt[node]];
	}
}
 
ll que(int node) {
	ll ans = 1e18;
	while (node >= 0) {
		auto Q = query(1,n,in[nxt[node]],in[node],1);
		smin(ans,Q);
		node = pr[nxt[node]];
	}
	return ans;
}
 
long long Query(int S, int X[], int T, int Y[]) {
	vi a,b;
	for (int i = 0;i < S;++i)
		a.pb(X[i]);
	for (int i = 0;i < T;++i)
		b.pb(Y[i]);
	if (a.size() > b.size())
		swap(a,b);
	sort(all(a),[&](int x,int y) {
			return D[x] > D[y];
		});
	for (auto it : a)
		upd(it,D[it]);
	ll mn1 = D[a[0]],mn2 = D[b[0]];
	for (auto it : a)
		smin(mn1,D[it]);
	for (auto it : b)
		smin(mn2,D[it]);
	ll ans = mn1 + mn2;//vertex 0 isn't "covered"
	for (auto it : b)
		smin(ans,D[it] + que(it));
	for (auto it : a)
		upd(it,0ll);
 	return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

factories.cpp: In function 'void Upd(int, int, int)':
factories.cpp:102:6: warning: unused variable 'm' [-Wunused-variable]
  int m = (l + r) / 2;
      ^

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