結果
問題 | No.2354 Poor Sight in Winter |
ユーザー | nu50218 |
提出日時 | 2023-06-16 23:42:00 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 333 ms / 2,000 ms |
コード長 | 5,525 bytes |
コンパイル時間 | 4,237 ms |
コンパイル使用メモリ | 248,160 KB |
実行使用メモリ | 19,864 KB |
最終ジャッジ日時 | 2024-06-24 16:57:36 |
合計ジャッジ時間 | 8,831 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 | 3 ms
5,376 KB |
testcase_06 | AC | 2 ms
5,376 KB |
testcase_07 | AC | 2 ms
5,376 KB |
testcase_08 | AC | 2 ms
5,376 KB |
testcase_09 | AC | 2 ms
5,376 KB |
testcase_10 | AC | 2 ms
5,376 KB |
testcase_11 | AC | 315 ms
19,652 KB |
testcase_12 | AC | 300 ms
19,652 KB |
testcase_13 | AC | 333 ms
19,864 KB |
testcase_14 | AC | 295 ms
19,840 KB |
testcase_15 | AC | 267 ms
19,668 KB |
testcase_16 | AC | 313 ms
19,652 KB |
testcase_17 | AC | 307 ms
19,652 KB |
testcase_18 | AC | 138 ms
10,768 KB |
testcase_19 | AC | 189 ms
17,240 KB |
testcase_20 | AC | 150 ms
11,168 KB |
testcase_21 | AC | 11 ms
6,940 KB |
testcase_22 | AC | 47 ms
6,948 KB |
testcase_23 | AC | 48 ms
7,032 KB |
testcase_24 | AC | 147 ms
16,172 KB |
testcase_25 | AC | 49 ms
6,940 KB |
testcase_26 | AC | 38 ms
6,944 KB |
testcase_27 | AC | 4 ms
6,940 KB |
testcase_28 | AC | 8 ms
6,944 KB |
ソースコード
#line 1 "main.cpp" #ifdef LOCAL #include <local.hpp> #else #pragma GCC optimize("O3,unroll-loops") #pragma GCC target("avx2,popcnt,lzcnt,abm,bmi,bmi2") #include <bits/stdc++.h> #define debug(...) ((void)0) #define postprocess(...) ((void)0) #endif #line 1 "library/graph/shortest_path.hpp" #include <algorithm> #include <cassert> #include <limits> #include <queue> #include <vector> template <typename weight> struct shortest_path { const weight unreachable = std::numeric_limits<weight>::max(); shortest_path() : _computed(false) {} shortest_path(const int& n, const int& m = 0) : _n(n), _computed(false) { if (m) _edges.reserve(m); } void set_number(const int& n, const int& m = 0) { _n = n; if (m) _edges.reserve(m); } void add_edge(const int& i, const int& j, const weight& w) { if (i == j) return; assert(0 <= i && i < _n); assert(0 <= j && j < _n); assert(0 <= w); _edges.emplace_back(i, j, w); } void compute(const int& s) { _s = s; _computed = true; _adj.resize(_n); for (auto&& e : _edges) { auto [u, v, w] = e; _adj[u].emplace_back(v, w); } _dist.resize(_n); std::fill(_dist.begin(), _dist.end(), unreachable); _par.resize(_n); std::fill(_par.begin(), _par.end(), -1); // select best algorithm if (!std::is_integral<weight>::value) { _dijkstra(s); return; } for (auto&& [_, __, cost] : _edges) { if (cost >= 2) { _dijkstra(s); return; } } for (auto&& [_, __, cost] : _edges) { if (cost == 0) { _bfs01(s); return; } } _bfs(s); } int s() { assert(_computed); return _s; } std::vector<weight> dist() { assert(_computed); return _dist; } weight dist(const int& t) { assert(_computed); return _dist[t]; } std::vector<int> path(int t) { assert(_computed); assert(0 <= t && t < _n); assert(_dist[t] != unreachable); std::vector<int> ret; while (t != _s) { ret.push_back(t); t = _par[t]; } ret.push_back(_s); std::reverse(ret.begin(), ret.end()); return ret; } private: // input values int _n; int _s; std::vector<std::tuple<int, int, weight>> _edges; // computed values bool _computed; std::vector<std::vector<std::pair<int, weight>>> _adj; std::vector<weight> _dist; std::vector<int> _par; void _bfs(const int& s) { std::queue<int> que; que.emplace(s); _dist[s] = 0; while (!que.empty()) { auto v = que.front(); que.pop(); for (auto&& [to, _] : _adj[v]) { if (_dist[to] == unreachable) { _dist[to] = _dist[v] + 1; _par[to] = v; que.emplace(to); } } } } void _bfs01(const int& s) { std::deque<int> que; _dist[s] = 0; que.emplace_back(s); while (!que.empty()) { auto v = que.front(); que.pop_front(); for (auto&& [to, cost] : _adj[v]) { weight d = _dist[v] + cost; if (d < _dist[to]) { _dist[to] = d; _par[to] = v; if (cost) { que.emplace_back(to); } else { que.emplace_front(to); } } } } } void _dijkstra(const int& s) { using que_class = std::pair<weight, int>; std::priority_queue<que_class, std::vector<que_class>, std::greater<que_class>> que; _dist[s] = 0; que.emplace(0, s); while (!que.empty()) { auto [d, v] = que.top(); que.pop(); if (_dist[v] != d) continue; for (auto&& [to, cost] : _adj[v]) { if (_dist[to] <= d + cost) continue; _dist[to] = d + cost; _par[to] = v; que.emplace(_dist[to], to); } } } }; #line 12 "main.cpp" using namespace std; using ll = long long; using ld = long double; void solve([[maybe_unused]] int test) { ll N, K; cin >> N >> K; const int s = 0; const int g = 1; ll x[N + 2], y[N + 2]; for (int i = 0; i < N + 2; i++) { cin >> x[i] >> y[i]; } ll imin = 0; ll imax = 3e5; auto dist = [&](int i, int j) { return abs(x[i] - x[j]) + abs(y[i] - y[j]); }; while (imax - imin > 1) { ll imid = (imin + imax) / 2; shortest_path<ll> sp(N + 2); for (int i = 0; i < N + 2; i++) { for (int j = 0; j < N + 2; j++) { sp.add_edge(i, j, (dist(i, j) - 1) / imid); sp.add_edge(j, i, (dist(j, i) - 1) / imid); } } sp.compute(s); (sp.dist(g) != sp.unreachable && sp.dist(g) <= K ? imax : imin) = imid; } cout << imax << endl; } int main() { ios::sync_with_stdio(false); cin.tie(nullptr); int t = 1; // cin >> t; for (int i = 1; i <= t; i++) { solve(i); } postprocess(); }