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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#65466#4839. Smaller LCAYaoBIGWA 1240ms55916kbC++176.5kb2022-12-01 09:37:372022-12-01 09:37:38

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2022-12-01 09:37:38]
  • 评测
  • 测评结果:WA
  • 用时:1240ms
  • 内存:55916kb
  • [2022-12-01 09:37:37]
  • 提交

answer

#include "bits/stdc++.h"
#define rep(i, a, n) for (auto i = a; i <= (n); ++i)
#define revrep(i, a, n) for (auto i = n; i >= (a); --i)
#define all(a) a.begin(), a.end()
#define sz(a) (int)(a).size()
template<class T> inline bool chmax(T &a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T &a, T b) { if (b < a) { a = b; return 1; } return 0; }
using namespace std;

template<class A, class B> string to_string(const pair<A, B> &p);
string to_string(const string &s) { return '"' + s + '"'; }
string to_string(const char *s) { return to_string((string) s); }
string to_string(char c) { return "'" + string(1, c) + "'"; }
string to_string(bool x) { return x ? "true" : "false"; }
template<class A> string to_string(const A &v) {
	bool first = 1;
	string res = "{";
	for (const auto &x: v) {
		if (!first) res += ", ";
		first = 0;
		res += to_string(x);
	}
	res += "}";
	return res;
}
template<class A, class B> string to_string(const pair<A, B> &p) {
	return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

void debug_out() { cerr << endl; }
template<class H, class... T> void debug_out(const H& h, const T&... t) {
	cerr << " " << to_string(h);
	debug_out(t...);
}
#ifndef ONLINE_JUDGE
	#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
	#define debug(...) if(0) puts("No effect.")
#endif

using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vvi = vector<vi>;

/**
 * Author: Yuhao Yao
 * Date: 22-10-25
 * Description: Heavy Light Decomposition for a rooted tree $T$. The root is set as $0$ by default. It can be modified easily for forest.
 *  $g$ should be the adjacent list of the tree $T$.
 *  $chainApply(u, v, func, val)$ and $chainAsk(u, v, func)$ are used for apply / query on the simple path from $u$ to $v$ on tree $T$. $func$ is the function you want to use to apply / query on a interval. (Say rangeApply / rangeAsk of Segment tree.)
 * Time: O(|T|) for building. O(\log |T|) for lca. O(\log |T| \cdot A) for chainApply / chainAsk, where $A$ is the running time of $func$ in chainApply / chainAsk.
 * Status: tested on https://codeforces.com/contest/487/problem/E.
 */

struct HLD {
	int n; /// start-hash
	vi fa, hson, dfn, dep, top;
	HLD(vector<vi> &g, int rt = 0): n(sz(g)), fa(n, -1), hson(n, -1), dfn(n), dep(n, 0), top(n) {
		vi siz(n);
		auto dfs = [&](auto &dfs, int now) -> void {
			siz[now] = 1;
			int mx = 0;
			for (auto v: g[now]) if (v != fa[now]) {
				dep[v] = dep[now] + 1;
				fa[v] = now;
				dfs(dfs, v);
				siz[now] += siz[v];
				if (mx < siz[v]) {
					mx = siz[v];
					hson[now] = v;
				}
			}
		};
		dfs(dfs, rt);

		int cnt = 0;
		auto getdfn = [&](auto &dfs, int now, int sp) {
			top[now] = sp;
			dfn[now] = cnt++;
			if (hson[now] == -1) return;
			dfs(dfs, hson[now], sp);
			for (auto v: g[now]) {
				if(v != hson[now] && v != fa[now]) dfs(dfs, v, v);
			}
		};
		getdfn(getdfn, rt, rt);
	} /// end-hash

	int lca(int u, int v) { /// start-hash
		while (top[u] != top[v]) {
			if (dep[top[u]] < dep[top[v]]) swap(u, v);
			u = fa[top[u]];
		}
		if (dep[u] < dep[v]) return u;
		else return v;
	} /// end-hash

	template<class... T> /// start-hash
	void chainApply(int u, int v, const function<void(int, int, T...)> &func, const T&... val) {
		int f1 = top[u], f2 = top[v];
		while (f1 != f2) {
			if (dep[f1] < dep[f2]) swap(f1, f2), swap(u, v);
			func(dfn[f1], dfn[u], val...);
			u = fa[f1]; f1 = top[u];
		}
		if (dep[u] < dep[v]) swap(u, v);
		func(dfn[v], dfn[u], val...); // change here if you want the info on edges.
	} /// end-hash

	template<class T> /// start-hash
	T chainAsk(int u, int v, const function<T(int, int)> &func) {
		int f1 = top[u], f2 = top[v];
		T ans{};
		while (f1 != f2) {
			if (dep[f1] < dep[f2]) swap(f1, f2), swap(u, v);
			ans = ans + func(dfn[f1], dfn[u]);
			u = fa[f1]; f1 = top[u];
		}
		if (dep[u] < dep[v]) swap(u, v);
		ans = ans + func(dfn[v], dfn[u]); // change here if you want the info on edges.
		return ans;
	} /// end-hash
};

/**
 * Author: Yuhao Yao
 * Date: 22-09-27
 * Description: Fenwick Tree.
 */
template<class T> struct BIT {
	int n;
	vector<T> a;

	BIT(int n): n(n), a(n + 1, 0) {}

	void Add(int i, T x) { 
		for (++i; i <= n; i += i & -i) a[i] += x;
	}

	T Ask(int i) {
		T ans{};
		for (++i; i; i -= i & -i) ans += a[i];
		return ans;
	}

	T rangeAsk(int l, int r) { return Ask(r) - Ask(l - 1); }

	// assuming prefix sums are non-decreasing, finds the first pos such that ask(pos) >= x.
	int lower_bound(T x) {
		assert(n > 0);
		int pos = 0;
		for (int h = 1 << __lg(n); h; h >>= 1) {
			if ((pos | h) <= n && a[pos | h] < x) {
				pos |= h;
				x -= a[pos];
			}
		}
		return pos;
	}
};

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	int n; cin >> n;
	vvi g(n);
	rep(i, 1, n - 1) {
		int x, y; cin >> x >> y;
		x--; y--;
		g[x].push_back(y);
		g[y].push_back(x);
	}
	HLD hld(g);
	auto fa = hld.fa;
	auto tin = hld.dfn;
	vi tout(n);
	auto getdfn = [&](auto &dfs, int now, int fa) -> void {
		tout[now] = tin[now];
		for (auto v: g[now]) if (v != fa) {
			dfs(dfs, v, now);
			chmax(tout[now], tout[v]);
		}
	};
	getdfn(getdfn, 0, -1);
	vector<pii> pairs;
	rep(x, 1, n) rep(y, x, n) {
		if (1ll * x * y > n) break;
		pairs.emplace_back(x, y);
	}
	sort(all(pairs), [](pii a, pii b) { return 1ll * a.first * a.second < 1ll * b.first * b.second; });
	BIT<ll> bit(n), bit2(n);
	auto ptr = pairs.begin();
	vector<ll> tag(n), tag1(n), tag2(n);
	rep(z, 1, n) {
		int now = z - 1;
		while (ptr != pairs.end() && 1ll * ptr->first * ptr->second < z) {
			auto [x, y] = *ptr;
			ptr++;
			int u = x - 1;
			int v = y - 1;
			int lca = hld.lca(u, v);
			if (lca + 1 > 1ll * x * y) {
				tag2[lca]++;
			}
			bit.Add(tin[u], 1);
			bit.Add(tin[v], 1);
			bit.Add(tin[lca], -1);
			if (fa[lca] != -1) bit.Add(fa[lca], -1);
			bit2.Add(tin[u], 1);
			bit2.Add(tin[v], 1);
			bit2.Add(tin[lca], -2);
		}
		tag[now] = bit.rangeAsk(tin[now], tout[now]);
		for (auto v: g[now]) if (v != fa[now]) {
			tag1[v] += tag[now] - bit2.rangeAsk(tin[v], tout[v]);
		}
	}
	ll tot = accumulate(all(tag2), 0ll);
	auto dfs = [&](auto &dfs, int now, int fa) -> void {
		for (auto v: g[now]) if (v != fa) {
			tag1[v] += tag1[now];
			tag2[v] += tag2[now];
			dfs(dfs, v, now);
		}
	};
	dfs(dfs, 0, -1);
	rep(now, 0, n - 1) {
		ll ans = 1ll * n * (n + 1) / 2 - (tag[now] + tag1[now] + tot - tag2[now]);
		printf("%lld\n", ans);
	}
	return 0;
}

詳細信息

Test #1:

score: 100
Accepted
time: 1ms
memory: 3648kb

input:

5
1 2
4 2
2 5
3 5

output:

15
15
15
15
14

result:

ok 5 number(s): "15 15 15 15 14"

Test #2:

score: -100
Wrong Answer
time: 1240ms
memory: 55916kb

input:

300000
40632 143306
32259 40632
225153 143306
269774 225153
289668 40632
191636 269774
85717 191636
58564 191636
156509 143306
289939 40632
247103 269774
40257 40632
98149 289668
142277 143306
291616 40257
46813 225153
56324 143306
277154 142277
53903 289668
114266 32259
152231 58564
241151 152231
4...

output:

44999437117
45000307324
45000331953
45000330914
44999549684
45000347970
44999874404
44999614805
44999580521
44999620598
45000317665
44999627843
44999760068
44999428454
45003764953
44999937804
44999612042
44999794083
44999804849
44999616318
45000255363
44999854065
44999950322
44999611884
44999414103
...

result:

wrong answer 2nd numbers differ - expected: '44999604051', found: '45000307324'