結果
問題 | No.2301 Namorientation |
ユーザー | poyon |
提出日時 | 2023-05-12 21:56:08 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 174 ms / 3,000 ms |
コード長 | 9,169 bytes |
コンパイル時間 | 2,858 ms |
コンパイル使用メモリ | 221,128 KB |
実行使用メモリ | 47,044 KB |
最終ジャッジ日時 | 2024-05-06 11:47:28 |
合計ジャッジ時間 | 12,009 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
5,248 KB |
testcase_01 | AC | 2 ms
5,376 KB |
testcase_02 | AC | 2 ms
5,376 KB |
testcase_03 | AC | 2 ms
5,376 KB |
testcase_04 | AC | 2 ms
5,376 KB |
testcase_05 | AC | 1 ms
5,376 KB |
testcase_06 | AC | 1 ms
5,376 KB |
testcase_07 | AC | 1 ms
5,376 KB |
testcase_08 | AC | 2 ms
5,376 KB |
testcase_09 | AC | 1 ms
5,376 KB |
testcase_10 | AC | 1 ms
5,376 KB |
testcase_11 | AC | 2 ms
5,376 KB |
testcase_12 | AC | 77 ms
17,764 KB |
testcase_13 | AC | 76 ms
16,512 KB |
testcase_14 | AC | 153 ms
27,380 KB |
testcase_15 | AC | 101 ms
19,408 KB |
testcase_16 | AC | 135 ms
23,936 KB |
testcase_17 | AC | 89 ms
18,368 KB |
testcase_18 | AC | 132 ms
24,420 KB |
testcase_19 | AC | 70 ms
15,616 KB |
testcase_20 | AC | 142 ms
24,192 KB |
testcase_21 | AC | 86 ms
19,168 KB |
testcase_22 | AC | 95 ms
47,044 KB |
testcase_23 | AC | 95 ms
46,548 KB |
testcase_24 | AC | 78 ms
39,384 KB |
testcase_25 | AC | 52 ms
21,168 KB |
testcase_26 | AC | 69 ms
26,540 KB |
testcase_27 | AC | 170 ms
27,520 KB |
testcase_28 | AC | 170 ms
27,376 KB |
testcase_29 | AC | 158 ms
27,520 KB |
testcase_30 | AC | 174 ms
27,624 KB |
testcase_31 | AC | 161 ms
27,508 KB |
ソースコード
// clang-format off #ifdef _LOCAL #include <pch.hpp> #else #include <bits/stdc++.h> #define cerr if (false) cerr #define debug_bar #define debug(...) #define debug2(vv) #define debug3(vvv) #endif using namespace std; using ll = long long; using ld = long double; using str = string; using P = pair<ll,ll>; using VP = vector<P>; using VVP = vector<VP>; using VC = vector<char>; using VS = vector<string>; using VVS = vector<VS>; using VI = vector<int>; using VVI = vector<VI>; using VVVI = vector<VVI>; using VLL = vector<ll>; using VVLL = vector<VLL>; using VVVLL = vector<VVLL>; using VB = vector<bool>; using VVB = vector<VB>; using VVVB = vector<VVB>; using VD = vector<double>; using VVD = vector<VD>; using VVVD = vector<VVD>; #define FOR(i,l,r) for (ll i = (l); i < (r); ++i) #define RFOR(i,l,r) for (ll i = (r)-1; (l) <= i; --i) #define REP(i,n) FOR(i,0,n) #define RREP(i,n) RFOR(i,0,n) #define FORE(e,c) for (auto&& e : c) #define ALL(c) (c).begin(), (c).end() #define SORT(c) sort(ALL(c)) #define RSORT(c) sort((c).rbegin(), (c).rend()) #define MIN(c) *min_element(ALL(c)) #define MAX(c) *max_element(ALL(c)) #define COUNT(c,v) count(ALL(c),(v)) #define len(c) ((ll)(c).size()) #define BIT(b,i) (((b)>>(i)) & 1) #define PCNT(b) ((ll)__builtin_popcountll(b)) #define LB(c,v) distance((c).begin(), lower_bound(ALL(c), (v))) #define UB(c,v) distance((c).begin(), upper_bound(ALL(c), (v))) #define UQ(c) do { SORT(c); (c).erase(unique(ALL(c)), (c).end()); (c).shrink_to_fit(); } while (0) #define END(...) do { print(__VA_ARGS__); exit(0); } while (0) constexpr ld EPS = 1e-10; constexpr ld PI = acosl(-1.0); constexpr int inf = (1 << 30) - (1 << 15); // 1,073,709,056 constexpr ll INF = (1LL << 62) - (1LL << 31); // 4,611,686,016,279,904,256 template<class... T> void input(T&... a) { (cin >> ... >> a); } void print() { cout << '\n'; } template<class T> void print(const T& a) { cout << a << '\n'; } template<class P1, class P2> void print(const pair<P1, P2>& a) { cout << a.first << " " << a.second << '\n'; } template<class T, class... Ts> void print(const T& a, const Ts&... b) { cout << a; (cout << ... << (cout << ' ', b)); cout << '\n'; } template<class T> void cout_line(const vector<T>& ans, int l, int r) { for (int i = l; i < r; i++) { if (i != l) { cout << ' '; } cout << ans[i]; } cout << '\n'; } template<class T> void print(const vector<T>& a) { cout_line(a, 0, a.size()); } template<class S, class T> bool chmin(S& a, const T b) { if (b < a) { a = b; return 1; } return 0; } template<class S, class T> bool chmax(S& a, const T b) { if (a < b) { a = b; return 1; } return 0; } template<class T> T SUM(const vector<T>& A) { return accumulate(ALL(A), T(0)); } template<class T> vector<T> cumsum(const vector<T>& A, bool offset = false) { int N = A.size(); vector<T> S(N+1, 0); for (int i = 0; i < N; i++) { S[i+1] = S[i] + A[i]; } if (not offset) { S.erase(S.begin()); } return S; } template<class T> string to_binary(T x, int B = 0) { string s; while (x) { s += ('0' + (x & 1)); x >>= 1; } while ((int)s.size() < B) { s += '0'; } reverse(s.begin(), s.end()); return s; } template<class F> ll binary_search(const F& is_ok, ll ok, ll ng) { while (abs(ok - ng) > 1) { ll m = (ok + ng) / 2; (is_ok(m) ? ok : ng) = m; } return ok; } template<class F> double binary_search_real(const F& is_ok, double ok, double ng, int iter = 90) { for (int i = 0; i < iter; i++) { double m = (ok + ng) / 2; (is_ok(m) ? ok : ng) = m; } return ok; } template<class T> using PQ_max = priority_queue<T>; template<class T> using PQ_min = priority_queue<T, vector<T>, greater<T>>; template<class T> T pick(stack<T>& s) { assert(not s.empty()); T x = s.top(); s.pop(); return x; } template<class T> T pick(queue<T>& q) { assert(not q.empty()); T x = q.front(); q.pop(); return x; } template<class T> T pick_front(deque<T>& dq) { assert(not dq.empty()); T x = dq.front(); dq.pop_front(); return x; } template<class T> T pick_back(deque<T>& dq) { assert(not dq.empty()); T x = dq.back(); dq.pop_back(); return x; } template<class T> T pick(PQ_min<T>& pq) { assert(not pq.empty()); T x = pq.top(); pq.pop(); return x; } template<class T> T pick(PQ_max<T>& pq) { assert(not pq.empty()); T x = pq.top(); pq.pop(); return x; } template<class T> T pick(vector<T>& v) { assert(not v.empty()); T x = v.back(); v.pop_back(); return x; } int to_int(const char c) { if (islower(c)) { return (c - 'a'); } if (isupper(c)) { return (c - 'A'); } if (isdigit(c)) { return (c - '0'); } assert(false); } char to_a(const int i) { assert(0 <= i && i < 26); return ('a' + i); } char to_A(const int i) { assert(0 <= i && i < 26); return ('A' + i); } char to_d(const int i) { assert(0 <= i && i <= 9); return ('0' + i); } ll min(int a, ll b) { return min((ll)a, b); } ll min(ll a, int b) { return min(a, (ll)b); } ll max(int a, ll b) { return max((ll)a, b); } ll max(ll a, int b) { return max(a, (ll)b); } ll mod(ll x, ll m) { assert(m > 0); return (x % m + m) % m; } ll ceil(ll a, ll b) { if (b < 0) { return ceil(-a, -b); } assert(b > 0); return (a < 0 ? a / b : (a + b - 1) / b); } ll floor(ll a, ll b) { if (b < 0) { return floor(-a, -b); } assert(b > 0); return (a > 0 ? a / b : (a - b + 1) / b); } ll powint(ll x, ll n) { assert(n >= 0); if (n == 0) { return 1; }; ll res = powint(x, n>>1); res *= res; if (n & 1) { res *= x; } return res; } pair<ll,ll> divmod(ll a, ll b) { assert(b != 0); ll q = floor(a, b); return make_pair(q, a - q * b); } ll bitlen(ll b) { if (b <= 0) { return 0; } return (64LL - __builtin_clzll(b)); } ll digitlen(ll n) { assert(n >= 0); if (n == 0) { return 1; } ll sum = 0; while (n > 0) { sum++; n /= 10; } return sum; } ll msb(ll b) { return (b <= 0 ? -1 : (63 - __builtin_clzll(b))); } ll lsb(ll b) { return (b <= 0 ? -1 : __builtin_ctzll(b)); } // -------------------------------------------------------- // 無向グラフの閉路を一つ見つける // ※自己ループ・多重辺は想定外 // - 閉路が存在しない場合,サイズ 0 の vector を返す // - 閉路が存在する場合,最初に見つけた閉路の頂点配列を返す // e.g.) C = {u1, u2, u3} のとき u1 -> u2 -> u3 -> u1 となっている template<class T> vector<int> find_cycle_undirected(const vector<vector<T>>& G) { int N = G.size(); vector<int> C; vector<bool> visited(N,false); // 訪問済フラグ(閉路検出なので 1 回の探索で十分) vector<bool> visiting(N,false); // 探索中の経路に含まれるか (deque に入っているか) deque<int> d; bool is_cycle = false; for (int s = 0; s < N; s++) if (not visited[s]) { auto rec = [&](auto&& self, int u, int p) -> void { if (visited[u]) return; for (const auto& [v, i] : G[u]) if (v != p) { if (visiting[v]) { // 閉路に無関係な頂点群を削除 while (v != d.front()) { d.pop_front(); } // 閉路を構成する頂点群を回収 while (not d.empty()){ C.push_back(d.front()); d.pop_front(); } is_cycle = true; return; } visiting[v] = true; d.push_back(v); self(self, v, u); if (is_cycle) { return; } visiting[v] = false; d.pop_back(); visited[v] = true; } }; visiting[s] = true; d.push_back(s); rec(rec, s, -1); if (is_cycle) { return C; } visiting[s] = false; d.pop_back(); visited[s] = true; } return C; // 閉路が存在しなかったので空 } // clang-format on int main() { ios::sync_with_stdio(false); cin.tie(nullptr); cout << fixed << setprecision(15); ll N; input(N); VVP G(N); VP E(N); REP (i, N) { int u, v; cin >> u >> v; u--; v--; G[u].emplace_back(v, i); G[v].emplace_back(u, i); E[i] = {u, v}; } vector<int> C = find_cycle_undirected(G); VB loop(N); FORE(c, C) { loop[c] = true; } VS ans(N); { VB vis(N); int s = C[0]; while (true) { int nxt = -1; for (auto [t, i] : G[s]) { if (not loop[t]) { continue; } if (vis[i]) { continue; } nxt = t; vis[i] = true; if (E[i].first == s) { ans[i] = "->"; } else { ans[i] = "<-"; } break; } if (nxt == -1) { break; } s = nxt; } } FORE(c, C) { auto dfs = [&](auto&& self, int u, int p) -> void { for (const auto& [v, i] : G[u]) { if (v == p) { continue; } if (loop[v]) { continue; } if (E[i].first == u) { ans[i] = "<-"; } else { ans[i] = "->"; } self(self, v, u); } }; dfs(dfs, c, -1); } REP (i, N) { print(ans[i]); } return 0; }