結果
問題 | No.1401 全自動マクロの作り方 |
ユーザー |
![]() |
提出日時 | 2021-02-19 23:13:50 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 3 ms / 3,153 ms |
コード長 | 3,904 bytes |
コンパイル時間 | 2,267 ms |
コンパイル使用メモリ | 206,880 KB |
最終ジャッジ日時 | 2025-01-19 01:39:26 |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 7 |
ソースコード
#include <stdio.h>#include <bits/stdc++.h>#include <algorithm>#include <algorithm>#include <utility>#include <vector>namespace atcoder {namespace internal {template <class E> struct csr {std::vector<int> start;std::vector<E> elist;csr(int n, const std::vector<std::pair<int, E>>& edges): start(n + 1), elist(edges.size()) {for (auto e : edges) {start[e.first + 1]++;}for (int i = 1; i <= n; i++) {start[i] += start[i - 1];}auto counter = start;for (auto e : edges) {elist[counter[e.first]++] = e.second;}}};// Reference:// R. Tarjan,// Depth-First Search and Linear Graph Algorithmsstruct scc_graph {public:scc_graph(int n) : _n(n) {}int num_vertices() { return _n; }void add_edge(int from, int to) { edges.push_back({from, {to}}); }// @return pair of (# of scc, scc id)std::pair<int, std::vector<int>> scc_ids() {auto g = csr<edge>(_n, edges);int now_ord = 0, group_num = 0;std::vector<int> visited, low(_n), ord(_n, -1), ids(_n);visited.reserve(_n);auto dfs = [&](auto self, int v) -> void {low[v] = ord[v] = now_ord++;visited.push_back(v);for (int i = g.start[v]; i < g.start[v + 1]; i++) {auto to = g.elist[i].to;if (ord[to] == -1) {self(self, to);low[v] = std::min(low[v], low[to]);} else {low[v] = std::min(low[v], ord[to]);}}if (low[v] == ord[v]) {while (true) {int u = visited.back();visited.pop_back();ord[u] = _n;ids[u] = group_num;if (u == v) break;}group_num++;}};for (int i = 0; i < _n; i++) {if (ord[i] == -1) dfs(dfs, i);}for (auto& x : ids) {x = group_num - 1 - x;}return {group_num, ids};}std::vector<std::vector<int>> scc() {auto ids = scc_ids();int group_num = ids.first;std::vector<int> counts(group_num);for (auto x : ids.second) counts[x]++;std::vector<std::vector<int>> groups(ids.first);for (int i = 0; i < group_num; i++) {groups[i].reserve(counts[i]);}for (int i = 0; i < _n; i++) {groups[ids.second[i]].push_back(i);}return groups;}private:int _n;struct edge {int to;};std::vector<std::pair<int, edge>> edges;};} // namespace internal} // namespace atcoder#include <cassert>#include <vector>namespace atcoder {struct scc_graph {public:scc_graph() : internal(0) {}scc_graph(int n) : internal(n) {}void add_edge(int from, int to) {int n = internal.num_vertices();assert(0 <= from && from < n);assert(0 <= to && to < n);internal.add_edge(from, to);}std::vector<std::vector<int>> scc() { return internal.scc(); }private:internal::scc_graph internal;};} // namespace atcoderusing namespace atcoder;using namespace std;#define rep(i,n) for (int i = 0; i < (n); ++i)#define Inf 1000000000int main(){int N;cin>>N;vector<int> d(N);vector<vector<int>> s(N);rep(i,N){cin>>d[i];s[i].resize(d[i]);rep(j,d[i]){cin>>s[i][j];}}scc_graph S(2000);rep(i,N){if(s[i][0]==s[i].back())continue;S.add_edge(s[i][0],s[i].back());}auto ans = S.scc();if(ans.size()!=2000){cout<<0<<endl;return 0;}cout<<2000<<endl;rep(i,2000){if(i!=0)cout<<' ';cout<<ans[i][0];}cout<<endl;return 0;}