제출 #878098

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
878098		TAhmed33	Tourism (JOI23_tourism)	C++98	28 / 100	5051 ms	87052 KiB

tourism

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 5e5 + 25;
int in[MAXN], out[MAXN], depth[MAXN];
pair <int, int> sparse[__lg(MAXN)][MAXN];
vector <int> adj[MAXN];
int n, m, q;
int cnt = 0;
void dfs (int pos, int par, int dep = 1) {
	depth[pos] = dep;
	sparse[0][++cnt] = {dep, pos};
	assert(cnt < MAXN);
	in[pos] = cnt;
	for (auto j : adj[pos]) {
		if (j != par) {
			dfs(j, pos, dep + 1);
			sparse[0][++cnt] = {dep, pos};
			assert(cnt < MAXN);
		}
	}
	out[pos] = dep;
}
int query (int l, int r) {
	if (l > r) swap(l, r);
	if (l == r) return sparse[0][l].second;
	int x = __lg(r - l + 1);
	return min(sparse[x][l], sparse[x][r - (1 << x) + 1]).second;
}
int arr[MAXN];
int main () {
	cin >> n >> m >> q;
	for (int i = 1; i < n; i++) {
		int a, b;
		cin >> a >> b;
		adj[a].push_back(b);
		adj[b].push_back(a);
	}
	dfs(1, -1);
	for (int i = 1; i <= __lg(cnt); i++) {
		for (int j = 1; j <= cnt; j++) {
			sparse[i][j] = min(sparse[i - 1][j], sparse[i - 1][j + (1 << (i - 1))]);
		}
	}
	for (int i = 1; i <= m; i++) cin >> arr[i];
	for (int i = 1; i <= q; i++) {
		int l, r;
		cin >> l >> r;
		vector <int> g;
		for (int j = l; j <= r; j++) g.push_back(arr[j]);
		sort(g.begin(), g.end(), [&] (int a, int b) {
			return in[a] < in[b];
		});
		int ans = depth[g[0]], lca = g[0];
		for (int j = 1; j < (int)g.size(); j++) {
			ans += depth[g[j]] - depth[query(in[g[j]], in[g[j - 1]])];
			lca = query(in[lca], in[g[j]]);
		}
		ans -= depth[lca]; ans++;
		cout << ans << '\n';
	}
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 7
• Subtask 4: 18 / 18
• Subtask 5: 0 / 24
• Subtask 6: 0 / 41