結果
問題 | No.1254 補強への架け橋 |
ユーザー | packer_jp |
提出日時 | 2020-10-09 22:21:45 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
WA
|
実行時間 | - |
コード長 | 4,423 bytes |
コンパイル時間 | 2,323 ms |
コンパイル使用メモリ | 222,868 KB |
実行使用メモリ | 38,400 KB |
最終ジャッジ日時 | 2024-07-20 12:24:02 |
合計ジャッジ時間 | 15,084 ms |
ジャッジサーバーID (参考情報) |
judge3 / 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 |
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testcase_00 | AC | 2 ms
5,248 KB |
testcase_01 | AC | 1 ms
5,376 KB |
testcase_02 | AC | 2 ms
5,376 KB |
testcase_03 | WA | - |
testcase_04 | WA | - |
testcase_05 | WA | - |
testcase_06 | WA | - |
testcase_07 | WA | - |
testcase_08 | WA | - |
testcase_09 | WA | - |
testcase_10 | AC | 2 ms
5,376 KB |
testcase_11 | WA | - |
testcase_12 | WA | - |
testcase_13 | WA | - |
testcase_14 | WA | - |
testcase_15 | WA | - |
testcase_16 | WA | - |
testcase_17 | WA | - |
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testcase_60 | WA | - |
testcase_61 | WA | - |
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testcase_87 | WA | - |
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testcase_92 | WA | - |
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testcase_100 | WA | - |
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testcase_102 | WA | - |
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testcase_106 | WA | - |
testcase_107 | WA | - |
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testcase_110 | WA | - |
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testcase_114 | WA | - |
testcase_115 | WA | - |
testcase_116 | WA | - |
testcase_117 | WA | - |
testcase_118 | WA | - |
testcase_119 | WA | - |
testcase_120 | WA | - |
testcase_121 | WA | - |
testcase_122 | WA | - |
testcase_123 | AC | 1 ms
5,376 KB |
testcase_124 | AC | 176 ms
38,400 KB |
testcase_125 | AC | 168 ms
38,400 KB |
ソースコード
#include <bits/stdc++.h> using namespace std; #define int long long #define rep(i, n) for (int i = 0; i < (int) (n); i++) #define reps(i, n) for (int i = 1; i <= (int) (n); i++) #define all(a) (a).begin(), (a).end() #define uniq(a) (a).erase(unique(all(a)), (a).end()) #define bit(n) (1LL << (n)) #define dump(a) cerr << #a " = " << (a) << endl using vint = vector<int>; using pint = pair<int, int>; using vpint = vector<pint>; template<typename T> using priority_queue_rev = priority_queue<T, vector<T>, greater<T>>; constexpr double PI = 3.1415926535897932384626433832795028; constexpr int DY[9] = {0, 1, 0, -1, 1, 1, -1, -1, 0}; constexpr int DX[9] = {1, 0, -1, 0, 1, -1, -1, 1, 0}; int sign(int a) { return (a > 0) - (a < 0); } int cdiv(int a, int b) { return (a - 1 + b) / b; } template<typename T> void fin(T a) { cout << a << endl; exit(0); } template<typename T> T sq(T a) { return a * a; } template<typename T, typename U> bool chmax(T &a, const U &b) { if (a < b) { a = b; return true; } return false; } template<typename T, typename U> bool chmin(T &a, const U &b) { if (b < a) { a = b; return true; } return false; } template<typename T, typename U> ostream &operator<<(ostream &os, const pair<T, U> &a) { os << "(" << a.first << ", " << a.second << ")"; return os; } template<typename T> ostream &operator<<(ostream &os, const vector<T> &a) { os << "{"; for (auto itr = a.begin(); itr != a.end(); itr++) { os << *itr << (next(itr) != a.end() ? ", " : ""); } os << "}"; return os; } template<typename T> ostream &operator<<(ostream &os, const deque<T> &a) { os << "{"; for (auto itr = a.begin(); itr != a.end(); itr++) { os << *itr << (next(itr) != a.end() ? ", " : ""); } os << "}"; return os; } template<typename T> ostream &operator<<(ostream &os, const set<T> &a) { os << "{"; for (auto itr = a.begin(); itr != a.end(); itr++) { os << *itr << (next(itr) != a.end() ? ", " : ""); } os << "}"; return os; } template<typename T> ostream &operator<<(ostream &os, const multiset<T> &a) { os << "{"; for (auto itr = a.begin(); itr != a.end(); itr++) { os << *itr << (next(itr) != a.end() ? ", " : ""); } os << "}"; return os; } template<typename T, typename U> ostream &operator<<(ostream &os, const map<T, U> &a) { os << "{"; for (auto itr = a.begin(); itr != a.end(); itr++) { os << *itr << (next(itr) != a.end() ? ", " : ""); } os << "}"; return os; } struct setup { static constexpr int PREC = 20; setup() { cout << fixed << setprecision(PREC); cerr << fixed << setprecision(PREC); }; } setup; struct low_link { int n; std::vector<int> ord, low, articulations; std::vector<std::vector<int>> adj; std::vector<std::pair<int, int>> bridges; low_link(const std::vector<std::vector<int>> &adj) : n(adj.size()), adj(adj), ord(n), low(n) { std::vector<bool> visited(n); int k = 0; auto dfs = [&](auto &&self, int cur, int par) -> void { visited[cur] = true; ord[cur] = k++; low[cur] = ord[cur]; int cnt = 0; bool is_articulation = false; for (int to : adj[cur]) { if (!visited[to]) { cnt++; self(self, to, cur); low[cur] = std::min(low[cur], low[to]); is_articulation |= ord[cur] <= low[to]; if (ord[cur] < low[to]) { bridges.emplace_back(std::minmax(cur, to)); } } else if (to != par) { low[cur] = std::min(low[cur], ord[to]); } } if (par == -1) { is_articulation = cnt >= 2; } if (is_articulation) { articulations.emplace_back(cur); } }; dfs(dfs, 0, -1); } }; signed main() { int N; cin >> N; vint a(N), b(N); vector<vint> adj(N); map<pint, int> idx; rep(i, N) { cin >> a[i] >> b[i], a[i]--, b[i]--; idx[{a[i], b[i]}] = i; adj[a[i]].emplace_back(b[i]); adj[b[i]].emplace_back(a[i]); } low_link ll(adj); cout << N - ll.bridges.size() << endl; vint ans(N, 1); for (pint p:ll.bridges) { ans[idx[p]] = 0; } rep(i, N) { if (ans[i]) { cout << i + 1 << " "; } } cout << endl; }