제출 #764900

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
764900		vjudge1	Roadside Advertisements (NOI17_roadsideadverts)	C++17	100 / 100	174 ms	18840 KiB

roadsideadverts

#include <bits/stdc++.h>
 
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define all(a) a.begin() , a.end()
#define F first
#define S second
 
using namespace std;
using ll = long long;
 
const int N = 2e5+5 , inf = 2e9 + 7;
const ll INF = 1e18 ,   mod = 1e9+7 ;

int P[N] , D[N] , H[N] , B[N] , pos[N];
vector<int> g[N] ,vec;
int a[N] , b[N] , d[N] , c[N] , NW , t[N*4] , t1[N*4] , u[N*4];
int up[N][20] , n , sz[N];
void upd(int v, int tl, int tr , int pos , int val){
	u[v] = -1;
	if(tl == tr){
		t[v] = val;
		t1[v] = val;
		return;
	}
	int tm = (tl+tr) >> 1;
	if(tm >= pos) upd(v*2,tl,tm,pos,val);
	else upd(v*2+1,tm+1,tr,pos,val);
	t[v] = t[v*2]+t[v*2+1];
	t1[v] = t[v];
}
int lca(int a , int b){
	if(D[a] > D[b]) swap(a,b);
	for(int i = 19; i >= 0; i--){
		if(D[a] <= D[up[b][i]]){
			b = up[b][i];
		}
	}
	if(a == b) return a;
	for(int i = 19; i >= 0; i--){
		if(up[a][i] != up[b][i]){
			b = up[b][i];
			a = up[a][i];
		}
	}
	return up[a][0];
}

void dfs(int v , int pr){
	P[v] = pr;
	D[v] = D[pr]+1;
	int mx = 0;
	sz[v] = 1;
	up[v][0] = pr;
	for(int i = 1; i < 20; i++) up[v][i] = up[up[v][i-1]][i-1];
	for(int i : g[v]){
		int to = (v^a[i]^b[i]);
		if(to == pr) continue;
		dfs(to,v);
		d[to] = c[i];
		sz[v] += sz[to];
		if(sz[to] > mx){
			mx = sz[to];
			H[v] = to;
		}
	}
}	
void decompose(int v ,int h){
	B[v] = h;
	pos[v] = ++NW;
	if(H[v]) decompose(H[v],h);
	for(int i : g[v]){
		int to = (v^a[i]^b[i]);
		if(to != P[v] && to != H[v]) decompose(to,to);
	}
}
void push(int v , int tl , int tr){
	if(tl == tr || u[v] == -1) return;
	t[v*2] = t1[v*2] * u[v];
	t[v*2+1] = t1[v*2+1] * u[v];
	u[v*2] = u[v];
	u[v*2+1] = u[v];
	u[v] = -1;
}
int getsum(int v ,int tl , int tr , int l , int r){
	push(v,tl,tr);
	if(l <= tl && tr <= r) return t[v];
	if(tl > r || tr < l) return 0;
	int tm = (tl+tr) >> 1;
	return getsum(v*2,tl,tm,l,r) + getsum(v*2+1,tm+1,tr,l,r);
}
void updlr(int v, int tl , int tr , int l , int r, int val){
	push(v,tl,tr);
	if(l > r) return;
	if(l <= tl && tr <= r){
		u[v] = val;
		t[v] = t1[v]*u[v];
		return;
	} 
	if(tl > r || tr < l) return;
	int tm = (tl+tr) >> 1;
	updlr(v*2,tl,tm,l,r,val);
	updlr(v*2+1,tm+1,tr,l,r,val);
	t[v] = t[v*2] + t[v*2+1];
}
int get(int a , int b){
	int res = 0;
	for(; B[a] != B[b]; a = P[B[a]]){
		res += getsum(1,0,n,pos[B[a]],pos[a]);
		updlr(1,0,n,pos[B[a]],pos[a],0);
	}
	res += getsum(1,0,n,pos[b]+1,pos[a]);
	updlr(1,0,n,pos[b]+1,pos[a],0);
	return res;
}
void clr(int a , int b){
	for(; B[a] != B[b]; a = P[B[a]])  updlr(1,0,n,pos[B[a]],pos[a],1);
	updlr(1,0,n,pos[b]+1,pos[a],1);
}
void solve(){
	cin >> n;
	for(int i = 1; i < n;i++){
		cin >> a[i] >> b[i] >> c[i];
		a[i]++;	
		b[i]++;	
		g[a[i]].push_back(i);		
		g[b[i]].push_back(i);	
	}
	dfs(1,0);
	decompose(1,1);
	for(int i = 1; i <= n; i++) upd(1,0,n,pos[i],d[i]);
	int q;
	cin >> q;
	for(int i = 1; i <= q; i++){
		int a , b , c , d, e;
		cin >> a >> b >> c >> d >> e;
		a++; b++; c++; d++; e++;
		int LCA = lca(a,b); LCA = lca(LCA,c); LCA = lca(LCA,d); LCA = lca(LCA,e);
		ll ans = get(a,LCA);
		ans += get(b,LCA);
		ans += get(c,LCA);
		ans += get(d,LCA);
		ans += get(e,LCA);
		cout << ans << "\n";
		clr(a,LCA);
		clr(b,LCA);
		clr(c,LCA);
		clr(d,LCA);
		clr(e,LCA);
	}
}
/*

*/
signed main(){
	ios;
	solve();
	return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 23 / 23
• Subtask 3: 40 / 40
• Subtask 4: 30 / 30