Submission #812726

#	Time	Username	Problem	Language	Result	Execution time	Memory
812726		hugo_pm	Tourism (JOI23_tourism)	C++17	28 / 100	5062 ms	26980 KiB

tourism

#include <bits/stdc++.h>
#define int long long
using namespace std;

#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define rep(i, a, b) for(int i = (a); i < (b); i++)
#define sz(v) ((int)((v).size()))

template<typename T>
void chmax(T &x, const T &v) { if (x < v) x = v; }
template<typename T>
void chmin(T &x, const T &v) { if (x > v) x = v; }

using pii = pair<int, int>;
using vi = vector<int>;

string to_string(string s) { return s; }
template <typename T> string to_string(T v) {
	bool first = true;
	string res = "[";
	for (const auto &x : v) {
		if (!first)
			res += ", ";
		first = false;
		res += to_string(x);
	}
	res += "]";
	return res;
}

template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

void dbg_out() { cout << endl; }
template <typename Head, typename... Tail> void dbg_out(Head H, Tail... T) {
	cout << ' ' << to_string(H);
	dbg_out(T...);
}

#ifdef DEBUG
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

const int LG = 17;
static_assert((1<<LG) > 100'000);
signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int nbNode, nbSpot, nbReq;
	cin >> nbNode >> nbSpot >> nbReq;
	vector<vi> adj(nbNode);
	rep(iEdge, 0, nbNode-1) {
		int u, v; cin >> u >> v;
		--u, --v;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	vector<vi> anc(LG, vi(nbNode, -1));
	vector<int> tin(nbNode), tout(nbNode), prof(nbNode);
	{
		int lastTime = 0;
		auto Dfs = [&] (auto dfs, int node, int parent) -> void {
			anc[0][node] = parent;
			rep(lvl, 0, LG-1) {
				if (anc[lvl][node] == -1) break;
				anc[lvl+1][node] = anc[lvl][anc[lvl][node]];
			}
			tin[node] = lastTime++;
			for (int child : adj[node]) if (child != parent) {
				prof[child] = prof[node]+1;
				dfs(dfs, child, node);
			}
			tout[node] = lastTime++;
		};
		Dfs(Dfs, 0, -1);
	}
	auto ancestor = [&] (int ance, int child) {
		return tin[ance] <= tin[child] && tout[child] <= tout[ance];
	};
	auto lca = [&] (int u, int v) {
		if (prof[u] > prof[v]) swap(u, v);
		int firstJmp = prof[v] - prof[u];
		rep(lvl, 0, LG) if ((1<<lvl) & firstJmp) {
			v = anc[lvl][v];
		}
		assert(prof[u] == prof[v]);
		if (u == v) return u;
		for (int lvl = LG-1; lvl >= 0; --lvl) {
			int pu = anc[lvl][u], pv = anc[lvl][v];
			if (pu != -1 && pv != -1 && pu != pv) {
				u = pu, v = pv;
			}
		}
		assert(u != v);
		u = anc[0][u], v = anc[0][v];
		assert(u == v);
		return u;
	};
	vector<int> spots(nbSpot);
	rep(iSpot, 0, nbSpot) {
		cin >> spots[iSpot];
		--spots[iSpot];
	}
	rep(iReq, 0, nbReq) {
		int L, R;
		cin >> L >> R;
		--L, --R;
		int ans = 0;
		vector<int> itv(begin(spots)+L, begin(spots)+R+1);
		sort(all(itv), [&] (int i, int j) { return tin[i] < tin[j]; });
		rep(i, 0, R-L) { // attention!
			itv.push_back(lca(itv[i], itv[i+1]));
		}
		sort(all(itv), [&] (int i, int j) { return tin[i] < tin[j]; });
		int szItv = sz(itv);
		auto Virt = [&] (auto virt, int iCur) -> int {
			int iLook = iCur+1;
			while (iLook < szItv && ancestor(itv[iCur], itv[iLook])) {
				ans += prof[itv[iLook]] - prof[itv[iCur]];
				iLook = virt(virt, iLook);
			}
			return iLook;
		};
		assert(Virt(Virt, 0) == szItv);
		cout << ans+1 << '\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