結果

問題 No.399 動的な領主
ユーザー antaanta
提出日時 2016-07-15 22:46:28
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 89 ms / 2,000 ms
コード長 4,048 bytes
コンパイル時間 2,298 ms
コンパイル使用メモリ 176,548 KB
実行使用メモリ 12,368 KB
最終ジャッジ日時 2024-11-07 19:06:29
合計ジャッジ時間 4,002 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge2
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
5,248 KB
testcase_01 AC 2 ms
5,248 KB
testcase_02 AC 2 ms
5,248 KB
testcase_03 AC 2 ms
5,248 KB
testcase_04 AC 3 ms
5,248 KB
testcase_05 AC 8 ms
5,248 KB
testcase_06 AC 77 ms
11,728 KB
testcase_07 AC 86 ms
11,732 KB
testcase_08 AC 83 ms
11,780 KB
testcase_09 AC 82 ms
11,784 KB
testcase_10 AC 2 ms
5,248 KB
testcase_11 AC 7 ms
5,248 KB
testcase_12 AC 66 ms
12,252 KB
testcase_13 AC 66 ms
12,368 KB
testcase_14 AC 55 ms
11,700 KB
testcase_15 AC 59 ms
11,700 KB
testcase_16 AC 58 ms
11,788 KB
testcase_17 AC 82 ms
11,780 KB
testcase_18 AC 89 ms
11,784 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include "bits/stdc++.h"
using namespace std;
#define rep(i,n) for(int (i)=0;(i)<(int)(n);++(i))
#define rer(i,l,u) for(int (i)=(int)(l);(i)<=(int)(u);++(i))
#define reu(i,l,u) for(int (i)=(int)(l);(i)<(int)(u);++(i))
static const int INF = 0x3f3f3f3f; static const long long INFL = 0x3f3f3f3f3f3f3f3fLL;
typedef vector<int> vi; typedef pair<int, int> pii; typedef vector<pair<int, int> > vpii; typedef long long ll;
template<typename T, typename U> static void amin(T &x, U y) { if(y < x) x = y; }
template<typename T, typename U> static void amax(T &x, U y) { if(x < y) x = y; }


vector<int> t_parent;
vi t_ord;

void tree_getorder(const vector<vi> &g, int root) {
	int n = g.size();
	t_parent.assign(n, -1);
	t_ord.clear();

	vector<int> stk; stk.push_back(root);
	while(!stk.empty()) {
		int i = stk.back(); stk.pop_back();
		t_ord.push_back(i);
		for(int j = (int)g[i].size() - 1; j >= 0; j --) {
			int c = g[i][j];
			if(t_parent[c] == -1 && c != root)
				stk.push_back(c);
			else
				t_parent[i] = c;
		}
	}
}

class SchieberVishkinLCA {
public:
	typedef unsigned Word;
	typedef int Vertex;
private:

	static inline Word lowestOneBit(Word v) {
		return v & (~v + 1);
	}
	static inline Word highestOneBitMask(Word v) {
		v |= v >> 1; v |= v >> 2; v |= v >> 4; v |= v >> 8; v |= v >> 16;
		return v >> 1;
	}

	std::vector<Word> indices;			//Vertex -> index
	std::vector<Word> maxHIndices;		//Vertex -> index
	std::vector<Word> ancestorHeights;	//Vertex -> Word
	std::vector<Vertex> pathParents;	//index-1 -> Vertex
public:

	void build(const std::vector<Vertex> &preorder, const std::vector<Vertex> &parents, Vertex root) {
		Vertex N = static_cast<Vertex>(preorder.size());

		ancestorHeights.resize(N);
		maxHIndices.resize(N);
		indices.resize(N);
		pathParents.resize(N);

		for(Vertex ix = 0; ix < N; ++ ix)
			indices[preorder[ix]] = ix + 1;

		for(Vertex i = 0; i < N; ++ i)
			maxHIndices[i] = indices[i];
		for(Vertex ix = N - 1; ix > 0; -- ix) {
			Vertex v = preorder[ix], parent = parents[v];
			if(lowestOneBit(maxHIndices[parent]) < lowestOneBit(maxHIndices[v]))
				maxHIndices[parent] = maxHIndices[v];
		}

		ancestorHeights[root] = 0;
		for(Vertex ix = 1; ix < N; ++ ix) {
			Vertex v = preorder[ix], parent = parents[v];
			ancestorHeights[v] = ancestorHeights[parent] | lowestOneBit(maxHIndices[v]);
		}

		pathParents[0] = root;
		for(Vertex ix = 1; ix < N; ++ ix) {
			Vertex v = preorder[ix], parent = parents[v];
			if(maxHIndices[v] != maxHIndices[parent])
				pathParents[indices[v] - 1] = parent;
			else
				pathParents[indices[v] - 1] = pathParents[indices[parent] - 1];
		}
	}

	Vertex query(Vertex v, Vertex u) const {
		Word Iv = maxHIndices[v], Iu = maxHIndices[u];
		Word hIv = lowestOneBit(Iv), hIu = lowestOneBit(Iu);
		Word hbMask = highestOneBitMask((Iv ^ Iu) | hIv | hIu);
		Word j = lowestOneBit(ancestorHeights[v] & ancestorHeights[u] & ~hbMask);
		Vertex x, y;
		if(j == hIv) x = v;
		else {
			Word kMask = highestOneBitMask(ancestorHeights[v] & (j - 1));
			x = pathParents[(indices[v] & ~kMask | (kMask + 1)) - 1];
		}
		if(j == hIu) y = u;
		else {
			Word kMask = highestOneBitMask(ancestorHeights[u] & (j - 1));
			y = pathParents[(indices[u] & ~kMask | (kMask + 1)) - 1];
		}
		return indices[x] < indices[y] ? x : y;
	}
};

int main() {
	int N;
	while(~scanf("%d", &N)) {
		vector<vector<int> > g(N);
		for(int i = 0; i < N - 1; ++ i) {
			int u, v;
			scanf("%d%d", &u, &v), -- u, -- v;
			g[u].push_back(v);
			g[v].push_back(u);
		}
		tree_getorder(g, 0);
		SchieberVishkinLCA lca;
		lca.build(t_ord, t_parent, 0);
		vector<int> cnt(N);
		int Q;
		scanf("%d", &Q);
		rep(ii, Q) {
			int A; int B;
			scanf("%d%d", &A, &B), -- A, -- B;
			int C = lca.query(A, B);
			++ cnt[A];
			++ cnt[B];
			if(C != 0) -- cnt[t_parent[C]];
			-- cnt[C];
		}
		for(int ix = (int)t_ord.size() - 1; ix > 0; -- ix) {
			int i = t_ord[ix], p = t_parent[i];
			cnt[p] += cnt[i];
		}
		ll ans = 0;
		rep(i, N) {
			int n = cnt[i];
			ans += (ll)n * (n + 1) / 2;
		}
		printf("%lld\n", ans);
	}
	return 0;
}
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