結果
問題 | No.2301 Namorientation |
ユーザー | Forested |
提出日時 | 2023-05-12 21:38:41 |
言語 | C++17(gcc12) (gcc 12.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 105 ms / 3,000 ms |
コード長 | 3,987 bytes |
コンパイル時間 | 1,350 ms |
コンパイル使用メモリ | 137,284 KB |
実行使用メモリ | 19,492 KB |
最終ジャッジ日時 | 2024-11-28 17:38:40 |
合計ジャッジ時間 | 9,326 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 30 |
ソースコード
#ifndef LOCAL #define FAST_IO #endif // ============ #include <algorithm> #include <array> #include <bitset> #include <cassert> #include <cmath> #include <iomanip> #include <iostream> #include <list> #include <map> #include <numeric> #include <queue> #include <random> #include <set> #include <stack> #include <string> #include <tuple> #include <unordered_map> #include <unordered_set> #include <utility> #include <vector> #define OVERRIDE(a, b, c, d, ...) d #define REP2(i, n) for (i32 i = 0; i < (i32)(n); ++i) #define REP3(i, m, n) for (i32 i = (i32)(m); i < (i32)(n); ++i) #define REP(...) OVERRIDE(__VA_ARGS__, REP3, REP2)(__VA_ARGS__) #define PER(i, n) for (i32 i = (i32)(n) - 1; i >= 0; --i) #define ALL(x) begin(x), end(x) using namespace std; using u32 = unsigned int; using u64 = unsigned long long; using i32 = signed int; using i64 = signed long long; using f64 = double; using f80 = long double; template <typename T> using Vec = vector<T>; template <typename T> bool chmin(T &x, const T &y) { if (x > y) { x = y; return true; } return false; } template <typename T> bool chmax(T &x, const T &y) { if (x < y) { x = y; return true; } return false; } template <typename T> Vec<tuple<i32, i32, T>> runlength(const Vec<T> &a) { if (a.empty()) { return Vec<tuple<i32, i32, T>>(); } Vec<tuple<i32, i32, T>> ret; i32 prv = 0; REP(i, 1, a.size()) { if (a[i - 1] != a[i]) { ret.emplace_back(prv, i, a[i - 1]); prv = i; } } ret.emplace_back(prv, (i32)a.size(), a.back()); return ret; } #ifdef INT128 using u128 = __uint128_t; using i128 = __int128_t; istream &operator>>(istream &is, i128 &x) { i64 v; is >> v; x = v; return is; } ostream &operator<<(ostream &os, i128 x) { os << (i64)x; return os; } istream &operator>>(istream &is, u128 &x) { u64 v; is >> v; x = v; return is; } ostream &operator<<(ostream &os, u128 x) { os << (u64)x; return os; } #endif [[maybe_unused]] constexpr i32 INF = 1000000100; [[maybe_unused]] constexpr i64 INF64 = 3000000000000000100; struct SetUpIO { SetUpIO() { #ifdef FAST_IO ios::sync_with_stdio(false); cin.tie(nullptr); #endif cout << fixed << setprecision(15); } } set_up_io; // ============ #ifdef DEBUGF #else #define DBG(x) (void)0 #endif struct Edge { i32 to; i32 id; }; int main() { i32 n; cin >> n; Vec<i32> a(n), b(n); REP(i, n) { cin >> a[i] >> b[i]; --a[i]; --b[i]; } Vec<Vec<Edge>> g(n); REP(i, n) { g[a[i]].emplace_back(Edge{b[i], i}); g[b[i]].emplace_back(Edge{a[i], i}); } Vec<i32> deg(n); REP(i, n) { deg[i] = (i32)g[i].size(); } queue<i32> que; REP(i, n) { if (deg[i] == 1) { que.push(i); } } Vec<i32> ans(n, -1); while (!que.empty()) { i32 v = que.front(); que.pop(); for (Edge e : g[v]) { if (ans[e.id] != -1) { continue; } if (a[e.id] == v) { ans[e.id] = 1; } else { ans[e.id] = 0; } if (--deg[e.to] == 1) { que.push(e.to); } } } DBG(ans); REP(i, n) { i32 cur = i; while (true) { i32 to = -1, id = -1; for (Edge e : g[cur]) { if (ans[e.id] == -1) { to = e.to; id = e.id; } } if (to == -1) { break; } if (cur == a[id]) { ans[id] = 1; } else { ans[id] = 0; } cur = to; } } REP(i, n) { if (ans[i]) { cout << "->\n"; } else { cout << "<-\n"; } } }