結果
問題 | No.1553 Lovely City |
ユーザー | rniya |
提出日時 | 2021-06-18 21:57:34 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
WA
|
実行時間 | - |
コード長 | 6,314 bytes |
コンパイル時間 | 2,789 ms |
コンパイル使用メモリ | 224,360 KB |
実行使用メモリ | 47,544 KB |
最終ジャッジ日時 | 2024-06-22 20:20:03 |
合計ジャッジ時間 | 10,779 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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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 | 1 ms
5,376 KB |
testcase_02 | AC | 32 ms
30,652 KB |
testcase_03 | WA | - |
testcase_04 | WA | - |
testcase_05 | WA | - |
testcase_06 | AC | 2 ms
5,376 KB |
testcase_07 | WA | - |
testcase_08 | WA | - |
testcase_09 | WA | - |
testcase_10 | WA | - |
testcase_11 | WA | - |
testcase_12 | WA | - |
testcase_13 | WA | - |
testcase_14 | WA | - |
testcase_15 | WA | - |
testcase_16 | WA | - |
testcase_17 | WA | - |
testcase_18 | WA | - |
testcase_19 | WA | - |
testcase_20 | WA | - |
testcase_21 | WA | - |
testcase_22 | WA | - |
testcase_23 | WA | - |
testcase_24 | WA | - |
testcase_25 | WA | - |
testcase_26 | WA | - |
testcase_27 | WA | - |
ソースコード
#define LOCAL #include <bits/stdc++.h> using namespace std; #pragma region Macros typedef long long ll; typedef __int128_t i128; typedef unsigned int uint; typedef unsigned long long ull; #define ALL(x) (x).begin(), (x).end() template <typename T> istream& operator>>(istream& is, vector<T>& v) { for (T& x : v) is >> x; return is; } template <typename T> ostream& operator<<(ostream& os, const vector<T>& v) { for (int i = 0; i < (int)v.size(); i++) { os << v[i] << (i + 1 == (int)v.size() ? "" : " "); } return os; } template <typename T, typename U> ostream& operator<<(ostream& os, const pair<T, U>& p) { os << '(' << p.first << ',' << p.second << ')'; return os; } template <typename T, typename U, typename V> ostream& operator<<(ostream& os, const tuple<T, U, V>& t) { os << '(' << get<0>(t) << ',' << get<1>(t) << ',' << get<2>(t) << ')'; return os; } template <typename T, typename U, typename V, typename W> ostream& operator<<(ostream& os, const tuple<T, U, V, W>& t) { os << '(' << get<0>(t) << ',' << get<1>(t) << ',' << get<2>(t) << ',' << get<3>(t) << ')'; return os; } template <typename T, typename U> ostream& operator<<(ostream& os, const map<T, U>& m) { os << '{'; for (auto itr = m.begin(); itr != m.end();) { os << '(' << itr->first << ',' << itr->second << ')'; if (++itr != m.end()) os << ','; } os << '}'; return os; } template <typename T, typename U> ostream& operator<<(ostream& os, const unordered_map<T, U>& m) { os << '{'; for (auto itr = m.begin(); itr != m.end();) { os << '(' << itr->first << ',' << itr->second << ')'; if (++itr != m.end()) os << ','; } os << '}'; return os; } template <typename T> ostream& operator<<(ostream& os, const set<T>& s) { os << '{'; for (auto itr = s.begin(); itr != s.end();) { os << *itr; if (++itr != s.end()) os << ','; } os << '}'; return os; } template <typename T> ostream& operator<<(ostream& os, const multiset<T>& s) { os << '{'; for (auto itr = s.begin(); itr != s.end();) { os << *itr; if (++itr != s.end()) os << ','; } os << '}'; return os; } template <typename T> ostream& operator<<(ostream& os, const unordered_set<T>& s) { os << '{'; for (auto itr = s.begin(); itr != s.end();) { os << *itr; if (++itr != s.end()) os << ','; } os << '}'; return os; } template <typename T> ostream& operator<<(ostream& os, const deque<T>& v) { for (int i = 0; i < (int)v.size(); i++) { os << v[i] << (i + 1 == (int)v.size() ? "" : " "); } return os; } void debug_out() { cerr << '\n'; } template <class Head, class... Tail> void debug_out(Head&& head, Tail&&... tail) { cerr << head; if (sizeof...(Tail) > 0) cerr << ", "; debug_out(move(tail)...); } #ifdef LOCAL #define debug(...) \ cerr << " "; \ cerr << #__VA_ARGS__ << " :[" << __LINE__ << ":" << __FUNCTION__ << "]" << '\n'; \ cerr << " "; \ debug_out(__VA_ARGS__) #else #define debug(...) 42 #endif template <typename T> T gcd(T x, T y) { return y != 0 ? gcd(y, x % y) : x; } template <typename T> T lcm(T x, T y) { return x / gcd(x, y) * y; } template <class T1, class T2> inline bool chmin(T1& a, T2 b) { if (a > b) { a = b; return true; } return false; } template <class T1, class T2> inline bool chmax(T1& a, T2 b) { if (a < b) { a = b; return true; } return false; } #pragma endregion /** * @brief Strongly Connected Components * @docs docs/graph/StronglyConnectedComponents.md */ struct StronglyConnectedComponents { vector<vector<int>> G, rG, C, T; vector<int> vs, cmp, used; StronglyConnectedComponents(int n) : G(n), rG(n), cmp(n), used(n) {} void add_edge(int u, int v) { G[u].emplace_back(v); rG[v].emplace_back(u); } void dfs(int v) { used[v] = 1; for (int u : G[v]) if (!used[u]) dfs(u); vs.emplace_back(v); } void rdfs(int v, int k) { used[v] = 1; cmp[v] = k; C[k].emplace_back(v); for (int u : rG[v]) if (!used[u]) rdfs(u, k); } int build() { int n = G.size(); for (int i = 0; i < n; i++) if (!used[i]) dfs(i); fill(used.begin(), used.end(), 0); int k = 0; for (int i = n - 1; i >= 0; --i) { if (!used[vs[i]]) { C.emplace_back(), T.emplace_back(); rdfs(vs[i], k++); } } for (int v = 0; v < n; v++) { for (int u : G[v]) { if (cmp[v] != cmp[u]) { T[cmp[v]].emplace_back(cmp[u]); } } } for (int i = 0; i < k; i++) { sort(T[i].begin(), T[i].end()); T[i].erase(unique(T[i].begin(), T[i].end()), T[i].end()); } return k; } int operator[](int i) const { return cmp[i]; } }; const int INF = 1e9; const long long IINF = 1e18; const int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1}; const char dir[4] = {'D', 'R', 'U', 'L'}; const long long MOD = 1000000007; // const long long MOD = 998244353; int main() { cin.tie(0); ios::sync_with_stdio(false); int N, M; cin >> N >> M; StronglyConnectedComponents SCC(N); for (int i = 0; i < M; i++) { int U, V; cin >> U >> V; SCC.add_edge(--U, --V); } int k = SCC.build(); vector<pair<int, int>> ans; auto &T = SCC.T, &C = SCC.C; set<int> s; for (int i = 0; i < k; i++) { int sz = C[i].size(); if (sz > 1) { for (int j = 0; j < sz; j++) { ans.emplace_back(C[i][j], C[i][(j + 1) % sz]); } } if (s.count(i)) s.erase(i); for (int& x : T[i]) s.emplace(x); if (!s.empty()) ans.emplace_back(C[i][0], C[i + 1][0]); } cout << ans.size() << '\n'; for (auto& p : ans) cout << p.first + 1 << ' ' << p.second + 1 << '\n'; return 0; }