結果
問題 | No.2949 Product on Tree |
ユーザー | noya2 |
提出日時 | 2024-11-02 17:51:21 |
言語 | C++23 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 543 ms / 2,000 ms |
コード長 | 3,620 bytes |
コンパイル時間 | 4,245 ms |
コンパイル使用メモリ | 269,664 KB |
実行使用メモリ | 72,700 KB |
最終ジャッジ日時 | 2024-11-02 17:51:54 |
合計ジャッジ時間 | 29,147 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
(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
6,816 KB |
testcase_02 | AC | 2 ms
6,816 KB |
testcase_03 | AC | 460 ms
44,676 KB |
testcase_04 | AC | 477 ms
43,788 KB |
testcase_05 | AC | 462 ms
44,920 KB |
testcase_06 | AC | 458 ms
45,016 KB |
testcase_07 | AC | 453 ms
44,032 KB |
testcase_08 | AC | 467 ms
45,532 KB |
testcase_09 | AC | 499 ms
46,040 KB |
testcase_10 | AC | 472 ms
46,708 KB |
testcase_11 | AC | 472 ms
48,108 KB |
testcase_12 | AC | 496 ms
52,468 KB |
testcase_13 | AC | 474 ms
53,180 KB |
testcase_14 | AC | 485 ms
56,112 KB |
testcase_15 | AC | 466 ms
60,428 KB |
testcase_16 | AC | 481 ms
57,384 KB |
testcase_17 | AC | 502 ms
58,672 KB |
testcase_18 | AC | 482 ms
58,484 KB |
testcase_19 | AC | 495 ms
62,416 KB |
testcase_20 | AC | 483 ms
61,696 KB |
testcase_21 | AC | 490 ms
62,380 KB |
testcase_22 | AC | 496 ms
63,648 KB |
testcase_23 | AC | 455 ms
45,452 KB |
testcase_24 | AC | 487 ms
45,608 KB |
testcase_25 | AC | 460 ms
45,756 KB |
testcase_26 | AC | 462 ms
45,856 KB |
testcase_27 | AC | 477 ms
45,936 KB |
testcase_28 | AC | 489 ms
45,992 KB |
testcase_29 | AC | 484 ms
46,508 KB |
testcase_30 | AC | 477 ms
47,592 KB |
testcase_31 | AC | 490 ms
49,720 KB |
testcase_32 | AC | 515 ms
50,592 KB |
testcase_33 | AC | 486 ms
57,084 KB |
testcase_34 | AC | 510 ms
65,244 KB |
testcase_35 | AC | 497 ms
60,032 KB |
testcase_36 | AC | 488 ms
68,508 KB |
testcase_37 | AC | 543 ms
69,140 KB |
testcase_38 | AC | 503 ms
63,676 KB |
testcase_39 | AC | 525 ms
64,560 KB |
testcase_40 | AC | 502 ms
71,880 KB |
testcase_41 | AC | 535 ms
67,224 KB |
testcase_42 | AC | 500 ms
72,700 KB |
testcase_43 | AC | 174 ms
33,552 KB |
testcase_44 | AC | 175 ms
34,080 KB |
testcase_45 | AC | 226 ms
42,820 KB |
testcase_46 | AC | 201 ms
38,740 KB |
testcase_47 | AC | 148 ms
29,220 KB |
testcase_48 | AC | 208 ms
39,824 KB |
ソースコード
#include<bits/stdc++.h> #include<atcoder/modint> // g[from] contains outgoing edges (to, edgeid(from, to)) // (E, op, e) is commutative monoid // ~edgeid(from, to) == edgeid(to, from) // return calculator of dp(r, v) template<class V, class E> auto rerootingdp(auto op, E e, auto put_edge, auto put_vertex, const std::vector<std::vector<std::pair<int, int>>> &g, int root = 0){ struct dp { // dp(r, v) : root is r, dp of subtree v // ans[v] = dp(v, v) // from[v] = dp(v, par(v)) // to[v] = dp(par(v), v) // from[root] and to[root] is undefined std::vector<V> ans, from, to; std::vector<int> down, up; std::vector<std::vector<int>> childs; bool is_in_subtree(int r, int v){ return down[r] < down[v] && up[v] <= up[r]; } V operator()(int r, int v){ if (r == v) return ans[v]; if (!is_in_subtree(v, r)) return to[v]; int le = 0, ri = childs[v].size(); while (ri - le > 1){ int md = (le + ri) / 2; if (down[childs[v][md]] <= down[r]){ le = md; } else { ri = md; } } return from[childs[v][le]]; } }; int n = g.size(); std::vector<E> from(n, e), to(n, e); std::vector<V> dp_to(n); std::vector<std::vector<int>> childs(n); std::vector<int> down(n), up(n); int t = 0; auto dfs = [&](auto sfs, int v, int f) -> void { down[v] = t++; childs[v].reserve(g[v].size()); for (auto [c, eid] : g[v]){ if (c == f) continue; childs[v].emplace_back(c); sfs(sfs, c, v); dp_to[c] = put_vertex(to[c], c); to[c] = put_edge(dp_to[c], eid); to[v] = op(to[v], to[c]); } up[v] = t; }; dfs(dfs, root, -1); std::vector<V> dp_ans(n), dp_from(n); std::vector<E> inner(n); auto bfs = [&](auto sfs, int v, int f) -> void { int sz = g[v].size(); inner[sz] = e; int i = sz-1; for (auto [c, eid] : g[v] | std::views::reverse){ if (c == f) continue; inner[i] = op(inner[i+1], to[c]); i--; } dp_ans[v] = put_vertex(op(inner[++i], from[v]), v); E rui = e; for (auto [c, eid] : g[v]){ if (c == f) continue; dp_from[c] = put_vertex(op(op(rui, inner[++i]), from[v]), v); from[c] = put_edge(dp_from[c], ~eid); rui = op(rui, to[c]); } for (auto [c, eid] : g[v]){ if (c == f) continue; sfs(sfs, c, v); } }; bfs(bfs, root, -1); return dp{dp_ans, dp_from, dp_to, down, up, childs}; } using mint = atcoder::modint998244353; int main(){ int n; std::cin >> n; std::vector<mint> a(n); for (auto &e : a){ int x; std::cin >> x; e = x; } std::vector<std::vector<std::pair<int,int>>> g(n); for (int i = 0; i < n-1; i++){ int u, v; std::cin >> u >> v; u--, v--; g[u].emplace_back(v,i); g[v].emplace_back(u,~i); } auto op = [&](mint l, mint r){ return l + r; }; auto pute = [&](mint v, int){ return v; }; auto putv = [&](mint e, int v){ return e * a[v] + a[v]; }; auto dp = rerootingdp<mint,mint>(op,mint(0),pute,putv,g); mint ans = 0; for (int i = 0; i < n; i++){ ans += dp(i,i); ans -= a[i]; } ans /= 2; std::cout << ans.val() << '\n'; }