結果

問題 No.2115 Making Forest Easy
ユーザー kwm_tkwm_t
提出日時 2022-10-29 17:43:25
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 584 ms / 2,000 ms
コード長 3,972 bytes
コンパイル時間 4,450 ms
コンパイル使用メモリ 280,396 KB
実行使用メモリ 242,176 KB
最終ジャッジ日時 2024-07-06 15:24:46
合計ジャッジ時間 25,390 ms
ジャッジサーバーID
(参考情報)
judge4 / judge2
このコードへのチャレンジ
(要ログイン)

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
6,820 KB
testcase_01 AC 2 ms
6,944 KB
testcase_02 AC 567 ms
241,920 KB
testcase_03 AC 480 ms
102,272 KB
testcase_04 AC 547 ms
199,936 KB
testcase_05 AC 463 ms
153,984 KB
testcase_06 AC 581 ms
241,920 KB
testcase_07 AC 458 ms
48,640 KB
testcase_08 AC 578 ms
241,920 KB
testcase_09 AC 429 ms
43,904 KB
testcase_10 AC 573 ms
242,048 KB
testcase_11 AC 482 ms
102,144 KB
testcase_12 AC 434 ms
43,776 KB
testcase_13 AC 435 ms
91,776 KB
testcase_14 AC 445 ms
43,776 KB
testcase_15 AC 449 ms
47,232 KB
testcase_16 AC 492 ms
102,400 KB
testcase_17 AC 45 ms
12,416 KB
testcase_18 AC 98 ms
43,008 KB
testcase_19 AC 312 ms
128,256 KB
testcase_20 AC 375 ms
41,088 KB
testcase_21 AC 42 ms
17,664 KB
testcase_22 AC 101 ms
23,552 KB
testcase_23 AC 428 ms
168,448 KB
testcase_24 AC 489 ms
102,272 KB
testcase_25 AC 223 ms
74,752 KB
testcase_26 AC 438 ms
43,648 KB
testcase_27 AC 257 ms
55,680 KB
testcase_28 AC 450 ms
48,512 KB
testcase_29 AC 66 ms
29,440 KB
testcase_30 AC 452 ms
47,456 KB
testcase_31 AC 548 ms
198,016 KB
testcase_32 AC 578 ms
242,176 KB
testcase_33 AC 584 ms
241,792 KB
testcase_34 AC 58 ms
14,720 KB
testcase_35 AC 130 ms
56,960 KB
testcase_36 AC 582 ms
241,664 KB
testcase_37 AC 243 ms
52,608 KB
testcase_38 AC 132 ms
29,952 KB
testcase_39 AC 236 ms
100,096 KB
testcase_40 AC 455 ms
47,232 KB
testcase_41 AC 437 ms
43,776 KB
testcase_42 AC 477 ms
102,144 KB
testcase_43 AC 205 ms
26,368 KB
testcase_44 AC 131 ms
29,824 KB
testcase_45 AC 343 ms
37,120 KB
testcase_46 AC 479 ms
102,016 KB
testcase_47 AC 182 ms
22,912 KB
testcase_48 AC 552 ms
193,024 KB
testcase_49 AC 557 ms
204,160 KB
testcase_50 AC 301 ms
64,640 KB
testcase_51 AC 191 ms
42,496 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>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//using mint = modint1000000007;
//const int mod = 1000000007;
using mint = modint998244353;
const int mod = 998244353;
//const int INF = 1e9;
//const long long LINF = 1e18;
//const bool debug = false;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n-1); i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r-1);i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define endl "\n"
#define P pair<long long,long long>
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
struct ReRooting {
	struct Edge {
		int to;
		Edge(int _to) :to(_to) {}
	};
	vector<int>a;
	vector<vector<Edge>>g;
	vector<vector<mint>>dp, ans;
	int sz;
	ReRooting(int _sz) :sz(_sz) {
		a.resize(sz);
		g.resize(sz);
		dp = vector<vector<mint>>(sz, vector<mint>(1001));
		ans = vector<vector<mint>>(sz, vector<mint>(1001));
	}
	void ReadGraph() {
		rep(i, sz - 1) {
			int a, b; cin >> a >> b; a--; b--;
			g[a].push_back({ b });
			g[b].push_back({ a });
		}
	}
	/*
	chi*chi
	chi*par
	*/
	// childs*child
	vector<mint> mergeChi(const vector<mint> &lh, const vector<mint> &rh) {//★★
		vector<mint> ret(1001);
		vector<mint> lsub = lh, rsub = rh;
		rep2(i, 1, 1001)rsub[0] += rsub[i];
		rep2(i, 1, lsub.size())lsub[i] = lsub[i - 1] + lh[i];
		rep2(i, 1, rsub.size())rsub[i] = rsub[i - 1] + rh[i];
		rep(i, ret.size()) ret[i] = lsub[i] * rsub[i];
		rrep2(i, 1, ret.size())ret[i] -= ret[i - 1];
		return ret;
	}
	// par*childs
	vector<mint> mergePar(const vector<mint> &lh, const vector<mint> &rh) {//★★
		vector<mint> ret(1001);
		vector<mint> lsub = lh, rsub = rh;
		rep2(i, 1, lsub.size())lsub[i] = lsub[i - 1] + lh[i];
		rep2(i, 1, rsub.size())rsub[i] = rsub[i - 1] + rh[i];
		rep(i, ret.size()) ret[i] = lsub[i] * rsub[i];
		rrep2(i, 1, ret.size())ret[i] -= ret[i - 1];
		return ret;
	}
	// par(部分木)*childs
	vector<mint> mergePar2(const vector<mint> &lh, const vector<mint> &rh) {//★★
		vector<mint> ret(1001);
		vector<mint> lsub = lh, rsub = rh;
		rep2(i, 1, 1001)rsub[0] += rsub[i];
		rep2(i, 1, lsub.size())lsub[i] = lsub[i - 1] + lh[i];
		rep2(i, 1, rsub.size())rsub[i] = rsub[i - 1] + rh[i];
		rep(i, ret.size()) ret[i] = lsub[i] * rsub[i];
		rrep2(i, 1, ret.size())ret[i] -= ret[i - 1];
		return ret;
	}
	void dfs(int v, int p = -1) {
		vector<mint>sub(1001);
		sub[0] = 1;
		for (auto e : g[v]) {
			if (p == e.to)continue;
			dfs(e.to, v);
			sub = mergeChi(sub, dp[e.to]);
		}
		dp[v][a[v]] = 1;
		dp[v] = mergePar(dp[v], sub);
	}
	void dfsR(int v, int p = -1) {
		ans[v] = dp[v];
		if (-1 != p) ans[v] = mergePar2(ans[v], dp[p]);
		vector<vector<mint>>vdata;
		for (auto e : g[v]) vdata.push_back(dp[e.to]);
		int sz = vdata.size();
		vector<vector<mint>>sumL(sz + 1, vector<mint>(1001)), sumR(sz + 1, vector<mint>(1001));
		sumL[0][0] = 1, sumR[0][0] = 1;
		rep(i, sz)sumL[i + 1] = mergeChi(sumL[i], vdata[i]);
		rep(i, sz)sumR[i + 1] = mergeChi(sumR[i], vdata[sz - i - 1]);
		for (int i = 0; i < g[v].size(); ++i) {
			auto e = g[v][i];
			if (p == e.to)continue;
			auto chi = mergePar(sumL[i], sumR[sz - (i + 1)]);
			vector<mint>sub(1001);
			sub[a[v]] = 1;
			dp[v] = mergePar(sub, chi);
			dfsR(e.to, v);
		}
	}
	void debug() {
		rep(i, sz) {
			rep(j, 10) cout << dp[i][j].val() << " ";
			cout << endl;
		}
		cout << endl;
	}
	void output() {
		mint ret = 0;
		rep(i, sz) rep(j, 1001) ret += ans[i][j] * j;
		cout << ret.val() << endl;
	}
	void solve() {
		rep(i, sz)cin >> a[i];
		ReadGraph();
		dfs(0);
		dfsR(0);
		output();
	}
};
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int n; cin >> n;
	ReRooting reroot(n);
	reroot.solve();
	return 0;
}
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