結果
問題 | No.1479 Matrix Eraser |
ユーザー | rniya |
提出日時 | 2021-04-16 20:56:24 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
TLE
(最新)
AC
(最初)
|
実行時間 | - |
コード長 | 9,029 bytes |
コンパイル時間 | 2,904 ms |
コンパイル使用メモリ | 220,420 KB |
最終ジャッジ日時 | 2025-01-20 19:10:02 |
ジャッジサーバーID (参考情報) |
judge2 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 33 TLE * 6 |
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 compress */ template <typename T> map<T, int> compress(vector<T>& v) { sort(v.begin(), v.end()); v.erase(unique(v.begin(), v.end()), v.end()); map<T, int> res; for (int i = 0; i < v.size(); i++) res[v[i]] = i; return res; } /** * @brief Hopcroft Karp * @docs docs/flow/HopcroftKarp.md */ struct HopcroftKarp { private: int n, m; bool matched; vector<vector<int>> G, rG; vector<int> match_l, match_r, level; void levelize() { queue<int> que; for (int i = 0; i < n; i++) { level[i] = -1; if (match_l[i] < 0) { level[i] = 0; que.emplace(i); } } while (!que.empty()) { int v = que.front(); que.pop(); for (int u : G[v]) { int w = match_r[u]; if (~w && level[w] < 0) { level[w] = level[v] + 1; que.emplace(w); } } } } bool find_augumenting_path(int v) { for (int u : G[v]) { int w = match_r[u]; if (w < 0 || (level[w] > level[v] && find_augumenting_path(w))) { match_l[v] = u; match_r[u] = v; return true; } } return false; } vector<vector<int>> build_residual_graph() { if (!matched) max_matching(); const int s = n + m, t = n + m + 1; vector<vector<int>> res(n + m + 2); for (int i = 0; i < n; i++) { if (match_l[i] < 0) { res[s].emplace_back(i); } } for (int i = 0; i < n; i++) { for (int j : G[i]) { if (match_l[i] == j) res[j + n].emplace_back(i); else res[i].emplace_back(j + n); } } return res; } vector<bool> find_residual_path() { auto g = build_residual_graph(); queue<int> que; vector<bool> visited(n + m + 2); que.emplace(n + m); visited[n + m] = true; while (!que.empty()) { int v = que.front(); que.pop(); for (int u : g[v]) { if (visited[u]) continue; visited[u] = true; que.emplace(u); } } return visited; } public: HopcroftKarp(int n, int m) : n(n), m(m), G(n), rG(m), match_l(n, -1), match_r(m, -1), level(n), matched(false) {} void add_edge(int u, int v) { G[u].emplace_back(v); rG[v].emplace_back(u); } vector<pair<int, int>> max_matching() { matched = true; while (1) { levelize(); int match = 0; for (int i = 0; i < n; i++) { if (match_l[i] < 0) { match += find_augumenting_path(i); } } if (!match) break; } vector<pair<int, int>> res; for (int i = 0; i < n; i++) { if (~match_l[i]) { res.emplace_back(i, match_l[i]); } } return res; } vector<int> min_vertex_cover() { auto visited = find_residual_path(); vector<int> res; for (int i = 0; i < n + m; i++) { if (visited[i] ^ (i < n)) { res.emplace_back(i); } } return res; } vector<int> max_independent_set() { auto visited = find_residual_path(); vector<int> res; for (int i = 0; i < n + m; i++) { if (visited[i] ^ (i >= n)) { res.emplace_back(i); } } return res; } vector<pair<int, int>> min_edge_cover() { auto res = max_matching(); for (int i = 0; i < n; i++) { if (~match_l[i]) continue; if (G[i].empty()) return {}; res.emplace_back(i, G[i][0]); } for (int i = 0; i < m; i++) { if (~match_r[i]) continue; if (rG[i].empty()) return {}; res.emplace_back(rG[i][0], i); } return res; } }; 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 H, W; cin >> H >> W; vector<vector<int>> A(H, vector<int>(W)); cin >> A; vector<int> comp; for (int i = 0; i < H; i++) { for (int j = 0; j < W; j++) { if (A[i][j] == 0) continue; comp.emplace_back(A[i][j]); } } map<int, int> mp = compress(comp); int sz = mp.size(); vector<vector<pair<int, int>>> es(sz); for (int i = 0; i < H; i++) { for (int j = 0; j < W; j++) { if (A[i][j] == 0) continue; es[mp[A[i][j]]].emplace_back(i, j); } } int ans = 0; for (auto& v : es) { HopcroftKarp HK(H, W); for (auto& p : v) HK.add_edge(p.first, p.second); ans += HK.max_matching().size(); } cout << ans << '\n'; return 0; }