結果
問題 | No.1326 ふたりのDominator |
ユーザー | QCFium |
提出日時 | 2020-12-02 22:30:13 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
TLE
|
実行時間 | - |
コード長 | 4,291 bytes |
コンパイル時間 | 2,206 ms |
コンパイル使用メモリ | 187,416 KB |
実行使用メモリ | 15,500 KB |
最終ジャッジ日時 | 2024-09-23 02:52:28 |
合計ジャッジ時間 | 6,028 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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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
12,192 KB |
testcase_01 | AC | 2 ms
6,940 KB |
testcase_02 | AC | 3 ms
5,376 KB |
testcase_03 | AC | 3 ms
5,376 KB |
testcase_04 | AC | 3 ms
5,376 KB |
testcase_05 | AC | 2 ms
5,376 KB |
testcase_06 | AC | 2 ms
5,376 KB |
testcase_07 | AC | 24 ms
5,376 KB |
testcase_08 | AC | 22 ms
5,376 KB |
testcase_09 | AC | 21 ms
5,376 KB |
testcase_10 | AC | 25 ms
5,376 KB |
testcase_11 | AC | 25 ms
5,376 KB |
testcase_12 | TLE | - |
testcase_13 | -- | - |
testcase_14 | -- | - |
testcase_15 | -- | - |
testcase_16 | -- | - |
testcase_17 | -- | - |
testcase_18 | -- | - |
testcase_19 | -- | - |
testcase_20 | -- | - |
testcase_21 | -- | - |
testcase_22 | -- | - |
testcase_23 | -- | - |
testcase_24 | -- | - |
ソースコード
#include <bits/stdc++.h> int ri() { int n; scanf("%d", &n); return n; } std::vector<std::vector<int> > hen; std::vector<int> ord, out; std::vector<int> tour; int ord_cnt = 0; std::vector<int> low; std::vector<int> depth; std::vector<int> parent; void dfs(int i, int prev) { parent[i] = prev; ord[i] = ord_cnt++; tour.push_back(i); low[i] = ord[i]; for (auto j : hen[i]) { if (j == prev) continue; if (ord[j] == -1) { depth[j] = depth[i] + 1; dfs(j, i); low[i] = std::min(low[i], low[j]); ord_cnt++; tour.push_back(i); } else low[i] = std::min(low[i], ord[j]); } out[i] = ord_cnt; } bool is_ancestor(int i, int j) { // returns if i is a descendant of j return ord[i] >= ord[j] && out[i] <= out[j]; } int main() { int n = ri(); int m = ri(); hen.resize(n); for (int i = 0; i < m; i++) { int a = ri() - 1; int b = ri() - 1; hen[a].push_back(b); hen[b].push_back(a); } ord.resize(n, -1); out.resize(n, -1); low.resize(n); depth.resize(n); parent.resize(n); dfs(0, -1); std::deque<std::pair<int, bool> > path; // exclusive int l_ord = 0; // actual int r_ord = 0; // actual int cnt = 0; auto move_r_1 = [&] (int next_ord) { int l = tour[l_ord]; int r = tour[r_ord]; int next = tour[next_ord]; if (l == r || r == next) {} // do nothing else if (next == parent[r] && !is_ancestor(l, r)) { // retract upwards if (path.size()) cnt -= path.back().second, path.pop_back(); } else if (next != parent[r] && is_ancestor(l, r) && is_ancestor(l, next)) { // retract downwards if (path.size()) cnt -= path.back().second, path.pop_back(); } else if (next == parent[r]) { // extend upwards int t = path.size() ? path.back().first : l; if (low[t] <= ord[next]) path.push_back({r, false}); // ok, false else path.push_back({r, true}), cnt++; } else if (is_ancestor(l, r)) { // first bent downwards extension int t1 = path.size() ? path.back().first : l; if (low[next] < ord[r] && low[t1] < ord[r]) path.push_back({r, false}); else path.push_back({r, true}), cnt++; } else { // purely/bent extend downwards int t = path.size() ? path.back().first : l; if (low[next] <= ord[t]) path.push_back({r, false}); else path.push_back({r, true}), cnt++; } r_ord = next_ord; }; auto move_l_1 = [&] (int next_ord) { int l = tour[l_ord]; int r = tour[r_ord]; int next = tour[next_ord]; if (l == r || r == next) {} // do nothing else if (next == parent[l] && !is_ancestor(r, l)) { // retract upwards if (path.size()) cnt -= path.front().second, path.pop_front(); } else if (next != parent[l] && is_ancestor(r, l) && is_ancestor(r, next)) { // retract downwards if (path.size()) cnt -= path.front().second, path.pop_front(); } else if (next == parent[l]) { // extend upwards int t = path.size() ? path.front().first : r; if (low[t] <= ord[next]) path.push_front({l, false}); // ok, false else path.push_front({l, true}), cnt++; } else if (is_ancestor(r, l)) { // first bent downwards extension int t1 = path.size() ? path.front().first : r; if (low[next] < ord[l] && low[t1] < ord[l]) path.push_front({l, false}); else path.push_front({l, true}), cnt++; } else { // purely/bent extend downwards int t = path.size() ? path.front().first : r; if (low[next] <= ord[t]) path.push_front({l, false}); else path.push_front({l, true}), cnt++; } l_ord = next_ord; }; auto move_r_to = [&] (int i) { while (r_ord < ord[i]) move_r_1(r_ord + 1); while (r_ord > ord[i]) move_r_1(r_ord - 1); }; auto move_l_to = [&] (int i) { while (l_ord < ord[i]) move_l_1(l_ord + 1); while (l_ord > ord[i]) move_l_1(l_ord - 1); }; struct Query { int l; int r; int id; }; int ONE = std::sqrt(ord_cnt); int BLOCK = (ord_cnt - 1) / ONE + 1; std::vector<Query> qs[BLOCK]; int q = ri(); for (int i = 0; i < q; i++) { int a = ri() - 1; int b = ri() - 1; qs[a / ONE].push_back({a, b, i}); } int res[q]; for (auto &i : qs) { if (!i.size()) continue; std::sort(i.begin(), i.end(), [] (auto &i, auto &j) { return i.r < j.r; }); // init path.clear(); l_ord = i[0].l; r_ord = i[0].l; cnt = 0; for (auto j : i) { move_l_to(j.l); move_r_to(j.r); res[j.id] = cnt; } } for (auto i : res) printf("%d\n", i); return 0; }