結果
問題 | No.1393 Median of Walk |
ユーザー |
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提出日時 | 2021-02-21 18:10:43 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 45 ms / 2,000 ms |
コード長 | 5,562 bytes |
コンパイル時間 | 3,999 ms |
コンパイル使用メモリ | 214,360 KB |
最終ジャッジ日時 | 2025-01-19 03:09:10 |
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 * 3 |
other | AC * 39 |
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 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; vector<int> w(M); vector<vector<pair<int, int>>> G(N); vector<tuple<int, int, int>> es; for (int i = 0; i < M; i++) { int u, v; cin >> u >> v >> w[i]; u--, v--; G[u].emplace_back(v, i); es.emplace_back(w[i], u, v); } sort(es.begin(), es.end()); queue<int> que; vector<int> dp(N, INF); dp[0] = 0; que.emplace(0); while (!que.empty()) { int v = que.front(); que.pop(); for (auto e : G[v]) { int u = e.first; if (dp[u] != INF) continue; dp[u] = dp[v] + 1; que.emplace(u); } } auto dfs = [&](auto self, int v, int x) -> void { for (auto e : G[v]) { int u = e.first, c = (w[e.second] <= x ? -1 : 1); if (max(-N, dp[v] + c) < dp[u]) { dp[u] = max(-N, dp[v] + c); self(self, u, x); } } }; auto update = [&](int u, int v, int x) { if (max(-N, dp[u] - 1) < dp[v]) { dp[v] = max(-N, dp[u] - 1); dfs(dfs, v, x); } }; vector<int> ans(N, INF); for (int i = 0; i < M; i++) { int x, u, v; tie(x, u, v) = es[i]; update(u, v, x); for (int j = 0; j < N; j++) { if (dp[j] <= 0) { ans[j] = min(ans[j], x); } } } for (int i = 1; i < N; i++) cout << (ans[i] == INF ? -1 : ans[i]) << '\n'; return 0; }