Submission #841944

#	Time	Username	Problem	Language	Result	Execution time	Memory
841944		vjudge1	Roadside Advertisements (NOI17_roadsideadverts)	C++17	7 / 100	888 ms	34640 KiB

roadsideadverts

#include <bits/stdc++.h>
#define ll long long
#define int ll
#define pii pair<int, int>
#define ff first
#define ss second
#define pb push_back
#define in insert
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)x.size()
#define deb(x) cout << #x << " = " << x << '\n';
#define file(x) freopen(x".in", "r", stdin), freopen(x".out", "w", stdout)
using namespace std;

// const int dx[] = {0, 1, 0, -1};
// const int dy[] = {1, 0, -1, 0};

const int inf = 1e9;
const ll INF = 1e18;
const int mod = 1e9 + 7;
const int N = 1e5 + 2;

int n, q, tin[N], tout[N], timer, up[N][20], pref[N], ans, a[105];
vector <pii> g[N];
map <int, bool> m;

void dfs(int v, int p) {
	tin[v] = ++timer;
	up[v][0] = p;
	for(int i = 1; i <= 19; i++) {
		up[v][i] = up[up[v][i - 1]][i - 1];
	}
	for(auto to:g[v]) {
		if(to.ff == p) continue;
		pref[to.ff] = pref[v] + to.ss;
		dfs(to.ff, v);
	}
	tout[v] = timer;
}

int get(int v) {
	int cnt = 0;
	for(int i = 1; i <= 5; i++) {
		if(tin[v] <= tin[a[i]] && tout[a[i]] <= tout[v]) cnt++;
	}
	return cnt;
}

void go(int v) {
	int cur = v, cnt = get(v);
	for(int i = 19; i >= 0; i--) {
		if(get(up[cur][i]) == cnt) cur = up[cur][i];
	}
	cur = up[cur][0];
	ans += pref[v] - pref[cur];
	m[v] = 1;
	if(!m[cur]) go(cur);
}

void solve() {
	cin >> n;
	for(int i = 1; i <= n - 1; i++) {
		int u, v, w;
		cin >> u >> v >> w;
		u++;
		v++;
		g[u].pb({v, w});
		g[v].pb({u, w});
	}
	dfs(1, 1);
	cin >> q;
	while(q--) {
		for(int i = 1; i <= 5; i++) {
			cin >> a[i];
			a[i]++;
		}
		m.clear();
		int v = a[1];
		for(int i = 19; i >= 0; i--) {
			if(get(up[v][i]) != 5) v = up[v][i];
		}
		m[up[v][0]] = 1;
		ans = 0;
		for(int i = 1; i <= n; i++) {
			if(!m[a[i]]) go(a[i]);
		}
		cout << ans << '\n';
	}
}

signed main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	int TT = 1;
	// cin >> TT;
	while(TT--) {
		solve();
	}
	return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 0 / 23
• Subtask 3: 0 / 40
• Subtask 4: 0 / 30